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ipv6: Don't add routes to ipv6 disabled interfaces.
[net-next-2.6.git] / net / ipv6 / addrconf.c
CommitLineData
1da177e4
LT		 1/*
2 * IPv6 Address [auto]configuration
3 * Linux INET6 implementation
4 *
5 * Authors:
1ab1457c 6 * Pedro Roque <roque@di.fc.ul.pt>
1da177e4
LT		 7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
8 *
1da177e4
LT		 9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version
12 * 2 of the License, or (at your option) any later version.
13 */
14
15/*
16 * Changes:
17 *
18 * Janos Farkas : delete timer on ifdown
19 * <chexum@bankinf.banki.hu>
20 * Andi Kleen : kill double kfree on module
21 * unload.
22 * Maciej W. Rozycki : FDDI support
23 * sekiya@USAGI : Don't send too many RS
24 * packets.
25 * yoshfuji@USAGI : Fixed interval between DAD
26 * packets.
27 * YOSHIFUJI Hideaki @USAGI : improved accuracy of
28 * address validation timer.
29 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041)
30 * support.
31 * Yuji SEKIYA @USAGI : Don't assign a same IPv6
32 * address on a same interface.
33 * YOSHIFUJI Hideaki @USAGI : ARCnet support
34 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to
35 * seq_file.
b1cacb68
YH		 36 * YOSHIFUJI Hideaki @USAGI : improved source address
37 * selection; consider scope,
38 * status etc.
1da177e4
LT		 39 */
40
1da177e4
LT		 41#include <linux/errno.h>
42#include <linux/types.h>
a0bffffc 43#include <linux/kernel.h>
1da177e4
LT		 44#include <linux/socket.h>
45#include <linux/sockios.h>
1da177e4
LT		 46#include <linux/net.h>
47#include <linux/in6.h>
48#include <linux/netdevice.h>
1823730f 49#include <linux/if_addr.h>
1da177e4
LT		 50#include <linux/if_arp.h>
51#include <linux/if_arcnet.h>
52#include <linux/if_infiniband.h>
53#include <linux/route.h>
54#include <linux/inetdevice.h>
55#include <linux/init.h>
5a0e3ad6 56#include <linux/slab.h>
1da177e4
LT		 57#ifdef CONFIG_SYSCTL
58#include <linux/sysctl.h>
59#endif
4fc268d2 60#include <linux/capability.h>
1da177e4
LT		 61#include <linux/delay.h>
62#include <linux/notifier.h>
543537bd 63#include <linux/string.h>
1da177e4 64
457c4cbc 65#include <net/net_namespace.h>
1da177e4
LT		 66#include <net/sock.h>
67#include <net/snmp.h>
68
69#include <net/ipv6.h>
70#include <net/protocol.h>
71#include <net/ndisc.h>
72#include <net/ip6_route.h>
73#include <net/addrconf.h>
74#include <net/tcp.h>
75#include <net/ip.h>
5d620266 76#include <net/netlink.h>
f24e3d65 77#include <net/pkt_sched.h>
1da177e4
LT		 78#include <linux/if_tunnel.h>
79#include <linux/rtnetlink.h>
80
81#ifdef CONFIG_IPV6_PRIVACY
82#include <linux/random.h>
1da177e4
LT		 83#endif
84
e21e8467 85#include <linux/uaccess.h>
7f7d9a6b 86#include <asm/unaligned.h>
1da177e4
LT		 87
88#include <linux/proc_fs.h>
89#include <linux/seq_file.h>
90
91/* Set to 3 to get tracing... */
92#define ACONF_DEBUG 2
93
94#if ACONF_DEBUG >= 3
95#define ADBG(x) printk x
96#else
97#define ADBG(x)
98#endif
99
100#define INFINITY_LIFE_TIME 0xFFFFFFFF
e21e8467 101#define TIME_DELTA(a, b) ((unsigned long)((long)(a) - (long)(b)))
1da177e4 102
b2db7564
YH		 103#define ADDRCONF_TIMER_FUZZ_MINUS (HZ > 50 ? HZ/50 : 1)
104#define ADDRCONF_TIMER_FUZZ (HZ / 4)
105#define ADDRCONF_TIMER_FUZZ_MAX (HZ)
106
1da177e4 107#ifdef CONFIG_SYSCTL
f52295a9 108static void addrconf_sysctl_register(struct inet6_dev *idev);
408c4768
PE		 109static void addrconf_sysctl_unregister(struct inet6_dev *idev);
110#else
111static inline void addrconf_sysctl_register(struct inet6_dev *idev)
112{
113}
114
115static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
116{
117}
1da177e4
LT		 118#endif
119
120#ifdef CONFIG_IPV6_PRIVACY
121static int __ipv6_regen_rndid(struct inet6_dev *idev);
1ab1457c 122static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
1da177e4
LT		 123static void ipv6_regen_rndid(unsigned long data);
124
125static int desync_factor = MAX_DESYNC_FACTOR * HZ;
1da177e4
LT		 126#endif
127
1b34be74 128static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
1da177e4
LT		 129static int ipv6_count_addresses(struct inet6_dev *idev);
130
131/*
132 * Configured unicast address hash table
133 */
c2e21293 134static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
5c578aed 135static DEFINE_SPINLOCK(addrconf_hash_lock);
1da177e4 136
1da177e4
LT		 137static void addrconf_verify(unsigned long);
138
8d06afab 139static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
1da177e4
LT		 140static DEFINE_SPINLOCK(addrconf_verify_lock);
141
142static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
143static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
144
93d9b7d7
JP		 145static void addrconf_type_change(struct net_device *dev,
146 unsigned long event);
1da177e4
LT		 147static int addrconf_ifdown(struct net_device *dev, int how);
148
e431b8c0 149static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags);
1da177e4
LT		 150static void addrconf_dad_timer(unsigned long data);
151static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
c5e33bdd 152static void addrconf_dad_run(struct inet6_dev *idev);
1da177e4
LT		 153static void addrconf_rs_timer(unsigned long data);
154static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
155static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
156
1ab1457c 157static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4 158 struct prefix_info *pinfo);
3e81c6da
DM		 159static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
160 struct net_device *dev);
1da177e4 161
e041c683 162static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
1da177e4 163
888c848e 164static struct ipv6_devconf ipv6_devconf __read_mostly = {
1da177e4
LT		 165 .forwarding = 0,
166 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
167 .mtu6 = IPV6_MIN_MTU,
168 .accept_ra = 1,
169 .accept_redirects = 1,
170 .autoconf = 1,
171 .force_mld_version = 0,
172 .dad_transmits = 1,
173 .rtr_solicits = MAX_RTR_SOLICITATIONS,
174 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
175 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
176#ifdef CONFIG_IPV6_PRIVACY
177 .use_tempaddr = 0,
178 .temp_valid_lft = TEMP_VALID_LIFETIME,
179 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
180 .regen_max_retry = REGEN_MAX_RETRY,
181 .max_desync_factor = MAX_DESYNC_FACTOR,
182#endif
183 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 184 .accept_ra_defrtr = 1,
c4fd30eb 185 .accept_ra_pinfo = 1,
930d6ff2
YH		 186#ifdef CONFIG_IPV6_ROUTER_PREF
187 .accept_ra_rtr_pref = 1,
52e16356 188 .rtr_probe_interval = 60 * HZ,
09c884d4
YH		 189#ifdef CONFIG_IPV6_ROUTE_INFO
190 .accept_ra_rt_info_max_plen = 0,
191#endif
930d6ff2 192#endif
fbea49e1 193 .proxy_ndp = 0,
0bcbc926 194 .accept_source_route = 0, /* we do not accept RH0 by default. */
778d80be 195 .disable_ipv6 = 0,
1b34be74 196 .accept_dad = 1,
1da177e4
LT		 197};
198
ab32ea5d 199static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
1da177e4
LT		 200 .forwarding = 0,
201 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
202 .mtu6 = IPV6_MIN_MTU,
203 .accept_ra = 1,
204 .accept_redirects = 1,
205 .autoconf = 1,
206 .dad_transmits = 1,
207 .rtr_solicits = MAX_RTR_SOLICITATIONS,
208 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
209 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
210#ifdef CONFIG_IPV6_PRIVACY
211 .use_tempaddr = 0,
212 .temp_valid_lft = TEMP_VALID_LIFETIME,
213 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
214 .regen_max_retry = REGEN_MAX_RETRY,
215 .max_desync_factor = MAX_DESYNC_FACTOR,
216#endif
217 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 218 .accept_ra_defrtr = 1,
c4fd30eb 219 .accept_ra_pinfo = 1,
930d6ff2
YH		 220#ifdef CONFIG_IPV6_ROUTER_PREF
221 .accept_ra_rtr_pref = 1,
52e16356 222 .rtr_probe_interval = 60 * HZ,
09c884d4
YH		 223#ifdef CONFIG_IPV6_ROUTE_INFO
224 .accept_ra_rt_info_max_plen = 0,
225#endif
930d6ff2 226#endif
fbea49e1 227 .proxy_ndp = 0,
0bcbc926 228 .accept_source_route = 0, /* we do not accept RH0 by default. */
778d80be 229 .disable_ipv6 = 0,
1b34be74 230 .accept_dad = 1,
1da177e4
LT		 231};
232
233/* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
1da177e4 234const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
1da177e4 235const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
f3ee4010
YH		 236const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
237const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
1da177e4 238
f24e3d65 239/* Check if a valid qdisc is available */
05297949 240static inline bool addrconf_qdisc_ok(const struct net_device *dev)
f24e3d65 241{
05297949 242 return !qdisc_tx_is_noop(dev);
f24e3d65
MC		 243}
244
2b5ead46
YH		 245/* Check if a route is valid prefix route */
246static inline int addrconf_is_prefix_route(const struct rt6_info *rt)
247{
248 return ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0);
249}
250
1da177e4
LT		 251static void addrconf_del_timer(struct inet6_ifaddr *ifp)
252{
253 if (del_timer(&ifp->timer))
254 __in6_ifa_put(ifp);
255}
256
e21e8467 257enum addrconf_timer_t {
1da177e4
LT		 258 AC_NONE,
259 AC_DAD,
260 AC_RS,
261};
262
263static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
264 enum addrconf_timer_t what,
265 unsigned long when)
266{
267 if (!del_timer(&ifp->timer))
268 in6_ifa_hold(ifp);
269
270 switch (what) {
271 case AC_DAD:
272 ifp->timer.function = addrconf_dad_timer;
273 break;
274 case AC_RS:
275 ifp->timer.function = addrconf_rs_timer;
276 break;
e21e8467
SH		 277 default:
278 break;
1da177e4
LT		 279 }
280 ifp->timer.expires = jiffies + when;
281 add_timer(&ifp->timer);
282}
283
7f7d9a6b
HX		 284static int snmp6_alloc_dev(struct inet6_dev *idev)
285{
7d720c3e 286 if (snmp_mib_init((void __percpu **)idev->stats.ipv6,
c69bce20 287 sizeof(struct ipstats_mib)) < 0)
7f7d9a6b 288 goto err_ip;
7d720c3e 289 if (snmp_mib_init((void __percpu **)idev->stats.icmpv6,
c69bce20 290 sizeof(struct icmpv6_mib)) < 0)
7f7d9a6b 291 goto err_icmp;
7d720c3e 292 if (snmp_mib_init((void __percpu **)idev->stats.icmpv6msg,
c69bce20 293 sizeof(struct icmpv6msg_mib)) < 0)
14878f75 294 goto err_icmpmsg;
7f7d9a6b
HX		 295
296 return 0;
297
14878f75 298err_icmpmsg:
7d720c3e 299 snmp_mib_free((void __percpu **)idev->stats.icmpv6);
7f7d9a6b 300err_icmp:
7d720c3e 301 snmp_mib_free((void __percpu **)idev->stats.ipv6);
7f7d9a6b 302err_ip:
aaf70ec7 303 return -ENOMEM;
7f7d9a6b
HX		 304}
305
16910b98 306static void snmp6_free_dev(struct inet6_dev *idev)
7f7d9a6b 307{
7d720c3e
TH		 308 snmp_mib_free((void __percpu **)idev->stats.icmpv6msg);
309 snmp_mib_free((void __percpu **)idev->stats.icmpv6);
310 snmp_mib_free((void __percpu **)idev->stats.ipv6);
7f7d9a6b
HX		 311}
312
1da177e4
LT		 313/* Nobody refers to this device, we may destroy it. */
314
8814c4b5
YH		 315static void in6_dev_finish_destroy_rcu(struct rcu_head *head)
316{
317 struct inet6_dev *idev = container_of(head, struct inet6_dev, rcu);
318 kfree(idev);
319}
320
1da177e4
LT		 321void in6_dev_finish_destroy(struct inet6_dev *idev)
322{
323 struct net_device *dev = idev->dev;
547b792c 324
502a2ffd 325 WARN_ON(!list_empty(&idev->addr_list));
547b792c
IJ		 326 WARN_ON(idev->mc_list != NULL);
327
1da177e4
LT		 328#ifdef NET_REFCNT_DEBUG
329 printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL");
330#endif
331 dev_put(dev);
332 if (!idev->dead) {
e21e8467 333 pr_warning("Freeing alive inet6 device %p\n", idev);
1da177e4
LT		 334 return;
335 }
336 snmp6_free_dev(idev);
8814c4b5 337 call_rcu(&idev->rcu, in6_dev_finish_destroy_rcu);
1da177e4
LT		 338}
339
7159039a
YH		 340EXPORT_SYMBOL(in6_dev_finish_destroy);
341
1da177e4
LT		 342static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
343{
344 struct inet6_dev *ndev;
345
346 ASSERT_RTNL();
347
348 if (dev->mtu < IPV6_MIN_MTU)
349 return NULL;
350
1ab1457c 351 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
322f74a4 352
1ab1457c
YH		 353 if (ndev == NULL)
354 return NULL;
322f74a4
IO		 355
356 rwlock_init(&ndev->lock);
357 ndev->dev = dev;
502a2ffd 358 INIT_LIST_HEAD(&ndev->addr_list);
359
c346dca1 360 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
322f74a4
IO		 361 ndev->cnf.mtu6 = dev->mtu;
362 ndev->cnf.sysctl = NULL;
363 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
364 if (ndev->nd_parms == NULL) {
365 kfree(ndev);
366 return NULL;
367 }
0187bdfb
BH		 368 if (ndev->cnf.forwarding)
369 dev_disable_lro(dev);
322f74a4
IO		 370 /* We refer to the device */
371 dev_hold(dev);
1da177e4 372
322f74a4
IO		 373 if (snmp6_alloc_dev(ndev) < 0) {
374 ADBG((KERN_WARNING
375 "%s(): cannot allocate memory for statistics; dev=%s.\n",
0dc47877 376 __func__, dev->name));
322f74a4
IO		 377 neigh_parms_release(&nd_tbl, ndev->nd_parms);
378 ndev->dead = 1;
379 in6_dev_finish_destroy(ndev);
380 return NULL;
381 }
1da177e4 382
322f74a4
IO		 383 if (snmp6_register_dev(ndev) < 0) {
384 ADBG((KERN_WARNING
385 "%s(): cannot create /proc/net/dev_snmp6/%s\n",
0dc47877 386 __func__, dev->name));
322f74a4
IO		 387 neigh_parms_release(&nd_tbl, ndev->nd_parms);
388 ndev->dead = 1;
389 in6_dev_finish_destroy(ndev);
390 return NULL;
391 }
392
393 /* One reference from device. We must do this before
394 * we invoke __ipv6_regen_rndid().
395 */
396 in6_dev_hold(ndev);
1da177e4 397
1b34be74
YH		 398 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
399 ndev->cnf.accept_dad = -1;
400
b077d7ab
YH		 401#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
402 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
403 printk(KERN_INFO
404 "%s: Disabled Multicast RS\n",
405 dev->name);
406 ndev->cnf.rtr_solicits = 0;
407 }
408#endif
409
1da177e4 410#ifdef CONFIG_IPV6_PRIVACY
372e6c8f 411 INIT_LIST_HEAD(&ndev->tempaddr_list);
b24b8a24 412 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
322f74a4
IO		 413 if ((dev->flags&IFF_LOOPBACK) ||
414 dev->type == ARPHRD_TUNNEL ||
9625ed72 415 dev->type == ARPHRD_TUNNEL6 ||
0be669bb 416 dev->type == ARPHRD_SIT ||
0be669bb 417 dev->type == ARPHRD_NONE) {
322f74a4
IO		 418 printk(KERN_INFO
419 "%s: Disabled Privacy Extensions\n",
420 dev->name);
421 ndev->cnf.use_tempaddr = -1;
422 } else {
423 in6_dev_hold(ndev);
424 ipv6_regen_rndid((unsigned long) ndev);
425 }
1da177e4
LT		 426#endif
427
f24e3d65 428 if (netif_running(dev) && addrconf_qdisc_ok(dev))
53aadcc9
HX		 429 ndev->if_flags |= IF_READY;
430
322f74a4
IO		 431 ipv6_mc_init_dev(ndev);
432 ndev->tstamp = jiffies;
f52295a9 433 addrconf_sysctl_register(ndev);
30c4cf57
DS		 434 /* protected by rtnl_lock */
435 rcu_assign_pointer(dev->ip6_ptr, ndev);
d88ae4cc
YH		 436
437 /* Join all-node multicast group */
f3ee4010 438 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
d88ae4cc 439
1da177e4
LT		 440 return ndev;
441}
442
cee89473 443static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
1da177e4
LT		 444{
445 struct inet6_dev *idev;
446
447 ASSERT_RTNL();
448
e21e8467
SH		 449 idev = __in6_dev_get(dev);
450 if (!idev) {
451 idev = ipv6_add_dev(dev);
452 if (!idev)
1da177e4
LT		 453 return NULL;
454 }
c5e33bdd 455
1da177e4
LT		 456 if (dev->flags&IFF_UP)
457 ipv6_mc_up(idev);
458 return idev;
459}
460
461#ifdef CONFIG_SYSCTL
462static void dev_forward_change(struct inet6_dev *idev)
463{
464 struct net_device *dev;
465 struct inet6_ifaddr *ifa;
1da177e4
LT		 466
467 if (!idev)
468 return;
469 dev = idev->dev;
0187bdfb
BH		 470 if (idev->cnf.forwarding)
471 dev_disable_lro(dev);
1da177e4 472 if (dev && (dev->flags & IFF_MULTICAST)) {
1da177e4 473 if (idev->cnf.forwarding)
f3ee4010 474 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
1da177e4 475 else
f3ee4010 476 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
1da177e4 477 }
502a2ffd 478
479 list_for_each_entry(ifa, &idev->addr_list, if_list) {
2c12a74c
MW		 480 if (ifa->flags&IFA_F_TENTATIVE)
481 continue;
1da177e4
LT		 482 if (idev->cnf.forwarding)
483 addrconf_join_anycast(ifa);
484 else
485 addrconf_leave_anycast(ifa);
486 }
487}
488
489
e186932b 490static void addrconf_forward_change(struct net *net, __s32 newf)
1da177e4
LT		 491{
492 struct net_device *dev;
493 struct inet6_dev *idev;
494
c6d14c84
ED		 495 rcu_read_lock();
496 for_each_netdev_rcu(net, dev) {
1da177e4
LT		 497 idev = __in6_dev_get(dev);
498 if (idev) {
e186932b
PE		 499 int changed = (!idev->cnf.forwarding) ^ (!newf);
500 idev->cnf.forwarding = newf;
1da177e4
LT		 501 if (changed)
502 dev_forward_change(idev);
503 }
1da177e4 504 }
c6d14c84 505 rcu_read_unlock();
1da177e4 506}
c8fecf22 507
b325fddb 508static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int old)
c8fecf22 509{
bff16c2f
PE		 510 struct net *net;
511
512 net = (struct net *)table->extra2;
441fc2a2 513 if (p == &net->ipv6.devconf_dflt->forwarding)
b325fddb
SH		 514 return 0;
515
88af182e
EB		 516 if (!rtnl_trylock()) {
517 /* Restore the original values before restarting */
518 *p = old;
5007392d 519 return restart_syscall();
88af182e 520 }
c8fecf22 521
e186932b
PE		 522 if (p == &net->ipv6.devconf_all->forwarding) {
523 __s32 newf = net->ipv6.devconf_all->forwarding;
524 net->ipv6.devconf_dflt->forwarding = newf;
525 addrconf_forward_change(net, newf);
c8fecf22
PE		 526 } else if ((!*p) ^ (!old))
527 dev_forward_change((struct inet6_dev *)table->extra1);
0187bdfb 528 rtnl_unlock();
c8fecf22
PE		 529
530 if (*p)
7b4da532 531 rt6_purge_dflt_routers(net);
b325fddb 532 return 1;
c8fecf22 533}
1da177e4
LT		 534#endif
535
5c578aed 536static void inet6_ifa_finish_destroy_rcu(struct rcu_head *head)
537{
538 struct inet6_ifaddr *ifp = container_of(head, struct inet6_ifaddr, rcu);
539 kfree(ifp);
540}
1da177e4 541
5c578aed 542/* Nobody refers to this ifaddr, destroy it */
1da177e4
LT		 543void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
544{
c2e21293 545 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
547b792c 546
1da177e4
LT		 547#ifdef NET_REFCNT_DEBUG
548 printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
549#endif
550
551 in6_dev_put(ifp->idev);
552
553 if (del_timer(&ifp->timer))
e21e8467 554 pr_notice("Timer is still running, when freeing ifa=%p\n", ifp);
1da177e4 555
e9d3e084 556 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
e21e8467 557 pr_warning("Freeing alive inet6 address %p\n", ifp);
1da177e4
LT		 558 return;
559 }
560 dst_release(&ifp->rt->u.dst);
561
5c578aed 562 call_rcu(&ifp->rcu, inet6_ifa_finish_destroy_rcu);
1da177e4
LT		 563}
564
e55ffac6
BH		 565static void
566ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
567{
502a2ffd 568 struct list_head *p;
8a6ce0c0 569 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
e55ffac6
BH		 570
571 /*
572 * Each device address list is sorted in order of scope -
573 * global before linklocal.
574 */
502a2ffd 575 list_for_each(p, &idev->addr_list) {
576 struct inet6_ifaddr *ifa
577 = list_entry(p, struct inet6_ifaddr, if_list);
8a6ce0c0 578 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
e55ffac6
BH		 579 break;
580 }
581
b54c9b98 582 list_add_tail(&ifp->if_list, p);
e55ffac6
BH		 583}
584
3a88a81d 585static u32 ipv6_addr_hash(const struct in6_addr *addr)
3eb84f49 586{
3eb84f49
YH		 587 /*
588 * We perform the hash function over the last 64 bits of the address
589 * This will include the IEEE address token on links that support it.
590 */
0eae88f3
ED		 591 return jhash_2words((__force u32)addr->s6_addr32[2],
592 (__force u32)addr->s6_addr32[3], 0)
3a88a81d 593 & (IN6_ADDR_HSIZE - 1);
3eb84f49
YH		 594}
595
1da177e4
LT		 596/* On success it returns ifp with increased reference count */
597
598static struct inet6_ifaddr *
599ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
e431b8c0 600 int scope, u32 flags)
1da177e4
LT		 601{
602 struct inet6_ifaddr *ifa = NULL;
603 struct rt6_info *rt;
3a88a81d 604 unsigned int hash;
1da177e4 605 int err = 0;
d68b8270
YH		 606 int addr_type = ipv6_addr_type(addr);
607
608 if (addr_type == IPV6_ADDR_ANY ||
609 addr_type & IPV6_ADDR_MULTICAST ||
610 (!(idev->dev->flags & IFF_LOOPBACK) &&
611 addr_type & IPV6_ADDR_LOOPBACK))
612 return ERR_PTR(-EADDRNOTAVAIL);
1da177e4 613
8814c4b5 614 rcu_read_lock_bh();
1da177e4
LT		 615 if (idev->dead) {
616 err = -ENODEV; /*XXX*/
617 goto out2;
618 }
619
56d417b1 620 if (idev->cnf.disable_ipv6) {
9bdd8d40
BH		 621 err = -EACCES;
622 goto out2;
623 }
624
5c578aed 625 spin_lock(&addrconf_hash_lock);
1da177e4
LT		 626
627 /* Ignore adding duplicate addresses on an interface */
c346dca1 628 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
1da177e4
LT		 629 ADBG(("ipv6_add_addr: already assigned\n"));
630 err = -EEXIST;
631 goto out;
632 }
633
322f74a4 634 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
1da177e4
LT		 635
636 if (ifa == NULL) {
637 ADBG(("ipv6_add_addr: malloc failed\n"));
638 err = -ENOBUFS;
639 goto out;
640 }
641
642 rt = addrconf_dst_alloc(idev, addr, 0);
643 if (IS_ERR(rt)) {
644 err = PTR_ERR(rt);
645 goto out;
646 }
647
1da177e4
LT		 648 ipv6_addr_copy(&ifa->addr, addr);
649
650 spin_lock_init(&ifa->lock);
e9d3e084 651 spin_lock_init(&ifa->state_lock);
1da177e4 652 init_timer(&ifa->timer);
c2e21293 653 INIT_HLIST_NODE(&ifa->addr_lst);
1da177e4
LT		 654 ifa->timer.data = (unsigned long) ifa;
655 ifa->scope = scope;
656 ifa->prefix_len = pfxlen;
657 ifa->flags = flags | IFA_F_TENTATIVE;
658 ifa->cstamp = ifa->tstamp = jiffies;
659
57f5f544
KF		 660 ifa->rt = rt;
661
95c385b4
NH		 662 /*
663 * part one of RFC 4429, section 3.3
664 * We should not configure an address as
665 * optimistic if we do not yet know the link
666 * layer address of our nexhop router
667 */
668
669 if (rt->rt6i_nexthop == NULL)
670 ifa->flags &= ~IFA_F_OPTIMISTIC;
671
1da177e4
LT		 672 ifa->idev = idev;
673 in6_dev_hold(idev);
674 /* For caller */
675 in6_ifa_hold(ifa);
676
677 /* Add to big hash table */
678 hash = ipv6_addr_hash(addr);
679
5c578aed 680 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
5c578aed 681 spin_unlock(&addrconf_hash_lock);
1da177e4
LT		 682
683 write_lock(&idev->lock);
684 /* Add to inet6_dev unicast addr list. */
e55ffac6 685 ipv6_link_dev_addr(idev, ifa);
1da177e4
LT		 686
687#ifdef CONFIG_IPV6_PRIVACY
688 if (ifa->flags&IFA_F_TEMPORARY) {
372e6c8f 689 list_add(&ifa->tmp_list, &idev->tempaddr_list);
1da177e4
LT		 690 in6_ifa_hold(ifa);
691 }
692#endif
693
1da177e4
LT		 694 in6_ifa_hold(ifa);
695 write_unlock(&idev->lock);
696out2:
8814c4b5 697 rcu_read_unlock_bh();
1da177e4 698
fd92833a 699 if (likely(err == 0))
e041c683 700 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
1da177e4
LT		 701 else {
702 kfree(ifa);
703 ifa = ERR_PTR(err);
704 }
705
706 return ifa;
707out:
5c578aed 708 spin_unlock(&addrconf_hash_lock);
1da177e4
LT		 709 goto out2;
710}
711
712/* This function wants to get referenced ifp and releases it before return */
713
714static void ipv6_del_addr(struct inet6_ifaddr *ifp)
715{
502a2ffd 716 struct inet6_ifaddr *ifa, *ifn;
1da177e4 717 struct inet6_dev *idev = ifp->idev;
4c5ff6a6 718 int state;
1da177e4
LT		 719 int hash;
720 int deleted = 0, onlink = 0;
721 unsigned long expires = jiffies;
722
723 hash = ipv6_addr_hash(&ifp->addr);
724
4c5ff6a6
HX		 725 spin_lock_bh(&ifp->state_lock);
726 state = ifp->state;
e9d3e084 727 ifp->state = INET6_IFADDR_STATE_DEAD;
4c5ff6a6
HX		 728 spin_unlock_bh(&ifp->state_lock);
729
730 if (state == INET6_IFADDR_STATE_DEAD)
731 goto out;
1da177e4 732
5c578aed 733 spin_lock_bh(&addrconf_hash_lock);
734 hlist_del_init_rcu(&ifp->addr_lst);
5c578aed 735 spin_unlock_bh(&addrconf_hash_lock);
1da177e4
LT		 736
737 write_lock_bh(&idev->lock);
738#ifdef CONFIG_IPV6_PRIVACY
739 if (ifp->flags&IFA_F_TEMPORARY) {
372e6c8f 740 list_del(&ifp->tmp_list);
741 if (ifp->ifpub) {
742 in6_ifa_put(ifp->ifpub);
743 ifp->ifpub = NULL;
1da177e4 744 }
372e6c8f 745 __in6_ifa_put(ifp);
1da177e4
LT		 746 }
747#endif
748
502a2ffd 749 list_for_each_entry_safe(ifa, ifn, &idev->addr_list, if_list) {
1da177e4 750 if (ifa == ifp) {
502a2ffd 751 list_del_init(&ifp->if_list);
1da177e4 752 __in6_ifa_put(ifp);
502a2ffd 753
1da177e4
LT		 754 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
755 break;
756 deleted = 1;
1d142804 757 continue;
1da177e4
LT		 758 } else if (ifp->flags & IFA_F_PERMANENT) {
759 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
760 ifp->prefix_len)) {
761 if (ifa->flags & IFA_F_PERMANENT) {
762 onlink = 1;
763 if (deleted)
764 break;
765 } else {
766 unsigned long lifetime;
767
768 if (!onlink)
769 onlink = -1;
770
771 spin_lock(&ifa->lock);
4bed72e4
YH		 772
773 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
774 /*
775 * Note: Because this address is
776 * not permanent, lifetime <
777 * LONG_MAX / HZ here.
778 */
1da177e4
LT		 779 if (time_before(expires,
780 ifa->tstamp + lifetime * HZ))
781 expires = ifa->tstamp + lifetime * HZ;
782 spin_unlock(&ifa->lock);
783 }
784 }
785 }
786 }
787 write_unlock_bh(&idev->lock);
788
b2238566
AV		 789 addrconf_del_timer(ifp);
790
1da177e4
LT		 791 ipv6_ifa_notify(RTM_DELADDR, ifp);
792
e041c683 793 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
1da177e4 794
1da177e4
LT		 795 /*
796 * Purge or update corresponding prefix
797 *
798 * 1) we don't purge prefix here if address was not permanent.
799 * prefix is managed by its own lifetime.
800 * 2) if there're no addresses, delete prefix.
801 * 3) if there're still other permanent address(es),
802 * corresponding prefix is still permanent.
803 * 4) otherwise, update prefix lifetime to the
804 * longest valid lifetime among the corresponding
805 * addresses on the device.
806 * Note: subsequent RA will update lifetime.
807 *
808 * --yoshfuji
809 */
810 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
811 struct in6_addr prefix;
812 struct rt6_info *rt;
c346dca1 813 struct net *net = dev_net(ifp->idev->dev);
1da177e4 814 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
6fda7350 815 rt = rt6_lookup(net, &prefix, NULL, ifp->idev->dev->ifindex, 1);
1da177e4 816
2b5ead46 817 if (rt && addrconf_is_prefix_route(rt)) {
1da177e4 818 if (onlink == 0) {
e0a1ad73 819 ip6_del_rt(rt);
1da177e4
LT		 820 rt = NULL;
821 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
822 rt->rt6i_expires = expires;
823 rt->rt6i_flags |= RTF_EXPIRES;
824 }
825 }
826 dst_release(&rt->u.dst);
827 }
828
4c5ff6a6 829out:
1da177e4
LT		 830 in6_ifa_put(ifp);
831}
832
833#ifdef CONFIG_IPV6_PRIVACY
834static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
835{
836 struct inet6_dev *idev = ifp->idev;
837 struct in6_addr addr, *tmpaddr;
838 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp;
eac55bf9 839 unsigned long regen_advance;
1da177e4
LT		 840 int tmp_plen;
841 int ret = 0;
842 int max_addresses;
95c385b4 843 u32 addr_flags;
1da177e4
LT		 844
845 write_lock(&idev->lock);
846 if (ift) {
847 spin_lock_bh(&ift->lock);
848 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
849 spin_unlock_bh(&ift->lock);
850 tmpaddr = &addr;
851 } else {
852 tmpaddr = NULL;
853 }
854retry:
855 in6_dev_hold(idev);
856 if (idev->cnf.use_tempaddr <= 0) {
857 write_unlock(&idev->lock);
858 printk(KERN_INFO
859 "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
860 in6_dev_put(idev);
861 ret = -1;
862 goto out;
863 }
864 spin_lock_bh(&ifp->lock);
865 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
866 idev->cnf.use_tempaddr = -1; /*XXX*/
867 spin_unlock_bh(&ifp->lock);
868 write_unlock(&idev->lock);
869 printk(KERN_WARNING
870 "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
871 in6_dev_put(idev);
872 ret = -1;
873 goto out;
874 }
875 in6_ifa_hold(ifp);
876 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
877 if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
878 spin_unlock_bh(&ifp->lock);
879 write_unlock(&idev->lock);
880 printk(KERN_WARNING
881 "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
882 in6_ifa_put(ifp);
883 in6_dev_put(idev);
884 ret = -1;
885 goto out;
886 }
887 memcpy(&addr.s6_addr[8], idev->rndid, 8);
888 tmp_valid_lft = min_t(__u32,
889 ifp->valid_lft,
890 idev->cnf.temp_valid_lft);
1ab1457c
YH		 891 tmp_prefered_lft = min_t(__u32,
892 ifp->prefered_lft,
1da177e4
LT		 893 idev->cnf.temp_prefered_lft - desync_factor / HZ);
894 tmp_plen = ifp->prefix_len;
895 max_addresses = idev->cnf.max_addresses;
896 tmp_cstamp = ifp->cstamp;
897 tmp_tstamp = ifp->tstamp;
898 spin_unlock_bh(&ifp->lock);
899
eac55bf9
BB		 900 regen_advance = idev->cnf.regen_max_retry *
901 idev->cnf.dad_transmits *
902 idev->nd_parms->retrans_time / HZ;
1da177e4 903 write_unlock(&idev->lock);
95c385b4 904
eac55bf9
BB		 905 /* A temporary address is created only if this calculated Preferred
906 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
907 * an implementation must not create a temporary address with a zero
908 * Preferred Lifetime.
909 */
910 if (tmp_prefered_lft <= regen_advance) {
911 in6_ifa_put(ifp);
912 in6_dev_put(idev);
913 ret = -1;
914 goto out;
915 }
916
95c385b4
NH		 917 addr_flags = IFA_F_TEMPORARY;
918 /* set in addrconf_prefix_rcv() */
919 if (ifp->flags & IFA_F_OPTIMISTIC)
920 addr_flags |= IFA_F_OPTIMISTIC;
921
1da177e4 922 ift = !max_addresses ||
1ab1457c 923 ipv6_count_addresses(idev) < max_addresses ?
1da177e4 924 ipv6_add_addr(idev, &addr, tmp_plen,
95c385b4
NH		 925 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
926 addr_flags) : NULL;
1da177e4
LT		 927 if (!ift || IS_ERR(ift)) {
928 in6_ifa_put(ifp);
929 in6_dev_put(idev);
930 printk(KERN_INFO
931 "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
932 tmpaddr = &addr;
933 write_lock(&idev->lock);
934 goto retry;
935 }
936
937 spin_lock_bh(&ift->lock);
938 ift->ifpub = ifp;
939 ift->valid_lft = tmp_valid_lft;
940 ift->prefered_lft = tmp_prefered_lft;
941 ift->cstamp = tmp_cstamp;
942 ift->tstamp = tmp_tstamp;
943 spin_unlock_bh(&ift->lock);
944
945 addrconf_dad_start(ift, 0);
946 in6_ifa_put(ift);
947 in6_dev_put(idev);
948out:
949 return ret;
950}
951#endif
952
953/*
072047e4 954 * Choose an appropriate source address (RFC3484)
1da177e4 955 */
a9b05723
YH		 956enum {
957 IPV6_SADDR_RULE_INIT = 0,
958 IPV6_SADDR_RULE_LOCAL,
959 IPV6_SADDR_RULE_SCOPE,
960 IPV6_SADDR_RULE_PREFERRED,
961#ifdef CONFIG_IPV6_MIP6
962 IPV6_SADDR_RULE_HOA,
963#endif
964 IPV6_SADDR_RULE_OIF,
965 IPV6_SADDR_RULE_LABEL,
966#ifdef CONFIG_IPV6_PRIVACY
967 IPV6_SADDR_RULE_PRIVACY,
968#endif
969 IPV6_SADDR_RULE_ORCHID,
970 IPV6_SADDR_RULE_PREFIX,
971 IPV6_SADDR_RULE_MAX
972};
973
072047e4 974struct ipv6_saddr_score {
a9b05723
YH		 975 int rule;
976 int addr_type;
977 struct inet6_ifaddr *ifa;
978 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
979 int scopedist;
980 int matchlen;
072047e4
YH		 981};
982
a9b05723 983struct ipv6_saddr_dst {
9acd9f3a 984 const struct in6_addr *addr;
a9b05723
YH		 985 int ifindex;
986 int scope;
987 int label;
7cbca67c 988 unsigned int prefs;
a9b05723 989};
072047e4 990
b6f99a21 991static inline int ipv6_saddr_preferred(int type)
1da177e4 992{
45bb0060 993 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
072047e4
YH		 994 return 1;
995 return 0;
1da177e4
LT		 996}
997
3de23255
BT		 998static int ipv6_get_saddr_eval(struct net *net,
999 struct ipv6_saddr_score *score,
a9b05723
YH		 1000 struct ipv6_saddr_dst *dst,
1001 int i)
1002{
1003 int ret;
1004
1005 if (i <= score->rule) {
1006 switch (i) {
1007 case IPV6_SADDR_RULE_SCOPE:
1008 ret = score->scopedist;
1009 break;
1010 case IPV6_SADDR_RULE_PREFIX:
1011 ret = score->matchlen;
1012 break;
1013 default:
1014 ret = !!test_bit(i, score->scorebits);
1015 }
1016 goto out;
1017 }
1018
1019 switch (i) {
1020 case IPV6_SADDR_RULE_INIT:
1021 /* Rule 0: remember if hiscore is not ready yet */
1022 ret = !!score->ifa;
1023 break;
1024 case IPV6_SADDR_RULE_LOCAL:
1025 /* Rule 1: Prefer same address */
1026 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1027 break;
1028 case IPV6_SADDR_RULE_SCOPE:
1029 /* Rule 2: Prefer appropriate scope
1030 *
1031 * ret
1032 * ^
1033 * -1 | d 15
1034 * ---+--+-+---> scope
1035 * |
1036 * | d is scope of the destination.
1037 * B-d | \
1038 * | \ <- smaller scope is better if
1039 * B-15 | \ if scope is enough for destinaion.
1040 * | ret = B - scope (-1 <= scope >= d <= 15).
1041 * d-C-1 | /
1042 * |/ <- greater is better
1043 * -C / if scope is not enough for destination.
1044 * /| ret = scope - C (-1 <= d < scope <= 15).
1045 *
1046 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1047 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1048 * Assume B = 0 and we get C > 29.
1049 */
1050 ret = __ipv6_addr_src_scope(score->addr_type);
1051 if (ret >= dst->scope)
1052 ret = -ret;
1053 else
1054 ret -= 128; /* 30 is enough */
1055 score->scopedist = ret;
1056 break;
1057 case IPV6_SADDR_RULE_PREFERRED:
1058 /* Rule 3: Avoid deprecated and optimistic addresses */
1059 ret = ipv6_saddr_preferred(score->addr_type) ||
1060 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
1061 break;
1062#ifdef CONFIG_IPV6_MIP6
1063 case IPV6_SADDR_RULE_HOA:
7cbca67c 1064 {
a9b05723 1065 /* Rule 4: Prefer home address */
7cbca67c
YH		 1066 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1067 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
a9b05723 1068 break;
7cbca67c 1069 }
a9b05723
YH		 1070#endif
1071 case IPV6_SADDR_RULE_OIF:
1072 /* Rule 5: Prefer outgoing interface */
1073 ret = (!dst->ifindex ||
1074 dst->ifindex == score->ifa->idev->dev->ifindex);
1075 break;
1076 case IPV6_SADDR_RULE_LABEL:
1077 /* Rule 6: Prefer matching label */
3de23255
BT		 1078 ret = ipv6_addr_label(net,
1079 &score->ifa->addr, score->addr_type,
a9b05723
YH		 1080 score->ifa->idev->dev->ifindex) == dst->label;
1081 break;
1082#ifdef CONFIG_IPV6_PRIVACY
1083 case IPV6_SADDR_RULE_PRIVACY:
7cbca67c 1084 {
a9b05723
YH		 1085 /* Rule 7: Prefer public address
1086 * Note: prefer temprary address if use_tempaddr >= 2
1087 */
7cbca67c
YH		 1088 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1089 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1090 score->ifa->idev->cnf.use_tempaddr >= 2;
1091 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
a9b05723 1092 break;
7cbca67c 1093 }
a9b05723
YH		 1094#endif
1095 case IPV6_SADDR_RULE_ORCHID:
1096 /* Rule 8-: Prefer ORCHID vs ORCHID or
1097 * non-ORCHID vs non-ORCHID
1098 */
1099 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1100 ipv6_addr_orchid(dst->addr));
1101 break;
1102 case IPV6_SADDR_RULE_PREFIX:
1103 /* Rule 8: Use longest matching prefix */
1104 score->matchlen = ret = ipv6_addr_diff(&score->ifa->addr,
1105 dst->addr);
1106 break;
1107 default:
1108 ret = 0;
1109 }
1110
1111 if (ret)
1112 __set_bit(i, score->scorebits);
1113 score->rule = i;
1114out:
1115 return ret;
1116}
1117
191cd582 1118int ipv6_dev_get_saddr(struct net *net, struct net_device *dst_dev,
9acd9f3a 1119 const struct in6_addr *daddr, unsigned int prefs,
7cbca67c 1120 struct in6_addr *saddr)
1da177e4 1121{
a9b05723
YH		 1122 struct ipv6_saddr_score scores[2],
1123 *score = &scores[0], *hiscore = &scores[1];
a9b05723 1124 struct ipv6_saddr_dst dst;
072047e4 1125 struct net_device *dev;
a9b05723 1126 int dst_type;
1da177e4 1127
a9b05723
YH		 1128 dst_type = __ipv6_addr_type(daddr);
1129 dst.addr = daddr;
1130 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1131 dst.scope = __ipv6_addr_src_scope(dst_type);
3de23255 1132 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
7cbca67c 1133 dst.prefs = prefs;
a9b05723
YH		 1134
1135 hiscore->rule = -1;
1136 hiscore->ifa = NULL;
1da177e4 1137
8814c4b5 1138 rcu_read_lock();
1da177e4 1139
c6d14c84 1140 for_each_netdev_rcu(net, dev) {
072047e4 1141 struct inet6_dev *idev;
072047e4 1142
a9b05723 1143 /* Candidate Source Address (section 4)
072047e4
YH		 1144 * - multicast and link-local destination address,
1145 * the set of candidate source address MUST only
1146 * include addresses assigned to interfaces
1147 * belonging to the same link as the outgoing
1148 * interface.
1149 * (- For site-local destination addresses, the
1150 * set of candidate source addresses MUST only
1151 * include addresses assigned to interfaces
1152 * belonging to the same site as the outgoing
1153 * interface.)
1154 */
a9b05723
YH		 1155 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1156 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1157 dst.ifindex && dev->ifindex != dst.ifindex)
072047e4 1158 continue;
1da177e4 1159
1da177e4 1160 idev = __in6_dev_get(dev);
072047e4
YH		 1161 if (!idev)
1162 continue;
1163
1164 read_lock_bh(&idev->lock);
502a2ffd 1165 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
a9b05723 1166 int i;
072047e4 1167
a9b05723 1168 /*
6b3ae80a
YH		 1169 * - Tentative Address (RFC2462 section 5.4)
1170 * - A tentative address is not considered
1171 * "assigned to an interface" in the traditional
95c385b4 1172 * sense, unless it is also flagged as optimistic.
6b3ae80a 1173 * - Candidate Source Address (section 4)
072047e4
YH		 1174 * - In any case, anycast addresses, multicast
1175 * addresses, and the unspecified address MUST
1176 * NOT be included in a candidate set.
1177 */
a9b05723
YH		 1178 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1179 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
6b3ae80a 1180 continue;
a9b05723
YH		 1181
1182 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1183
1184 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1185 score->addr_type & IPV6_ADDR_MULTICAST)) {
072047e4 1186 LIMIT_NETDEBUG(KERN_DEBUG
3b6d821c 1187 "ADDRCONF: unspecified / multicast address "
072047e4
YH		 1188 "assigned as unicast address on %s",
1189 dev->name);
1190 continue;
1191 }
1192
a9b05723
YH		 1193 score->rule = -1;
1194 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1195
1196 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1197 int minihiscore, miniscore;
1198
3de23255
BT		 1199 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1200 miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
a9b05723
YH		 1201
1202 if (minihiscore > miniscore) {
1203 if (i == IPV6_SADDR_RULE_SCOPE &&
1204 score->scopedist > 0) {
1205 /*
1206 * special case:
1207 * each remaining entry
1208 * has too small (not enough)
1209 * scope, because ifa entries
1210 * are sorted by their scope
1211 * values.
1212 */
1213 goto try_nextdev;
1214 }
1215 break;
1216 } else if (minihiscore < miniscore) {
a9b05723
YH		 1217 if (hiscore->ifa)
1218 in6_ifa_put(hiscore->ifa);
1219
1220 in6_ifa_hold(score->ifa);
1221
a0bffffc 1222 swap(hiscore, score);
a9b05723
YH		 1223
1224 /* restore our iterator */
1225 score->ifa = hiscore->ifa;
1226
1227 break;
1da177e4 1228 }
072047e4 1229 }
1da177e4 1230 }
a9b05723 1231try_nextdev:
072047e4 1232 read_unlock_bh(&idev->lock);
1da177e4 1233 }
8814c4b5 1234 rcu_read_unlock();
1da177e4 1235
a9b05723 1236 if (!hiscore->ifa)
072047e4 1237 return -EADDRNOTAVAIL;
1ab1457c 1238
a9b05723
YH		 1239 ipv6_addr_copy(saddr, &hiscore->ifa->addr);
1240 in6_ifa_put(hiscore->ifa);
072047e4 1241 return 0;
1da177e4 1242}
5e5f3f0f 1243EXPORT_SYMBOL(ipv6_dev_get_saddr);
1da177e4 1244
95c385b4
NH		 1245int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1246 unsigned char banned_flags)
1da177e4
LT		 1247{
1248 struct inet6_dev *idev;
1249 int err = -EADDRNOTAVAIL;
1250
8814c4b5 1251 rcu_read_lock();
e21e8467
SH		 1252 idev = __in6_dev_get(dev);
1253 if (idev) {
1da177e4
LT		 1254 struct inet6_ifaddr *ifp;
1255
1256 read_lock_bh(&idev->lock);
502a2ffd 1257 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1258 if (ifp->scope == IFA_LINK &&
1259 !(ifp->flags & banned_flags)) {
1da177e4
LT		 1260 ipv6_addr_copy(addr, &ifp->addr);
1261 err = 0;
1262 break;
1263 }
1264 }
1265 read_unlock_bh(&idev->lock);
1266 }
8814c4b5 1267 rcu_read_unlock();
1da177e4
LT		 1268 return err;
1269}
1270
1271static int ipv6_count_addresses(struct inet6_dev *idev)
1272{
1273 int cnt = 0;
1274 struct inet6_ifaddr *ifp;
1275
1276 read_lock_bh(&idev->lock);
502a2ffd 1277 list_for_each_entry(ifp, &idev->addr_list, if_list)
1da177e4
LT		 1278 cnt++;
1279 read_unlock_bh(&idev->lock);
1280 return cnt;
1281}
1282
bfeade08
DL		 1283int ipv6_chk_addr(struct net *net, struct in6_addr *addr,
1284 struct net_device *dev, int strict)
1da177e4 1285{
eedf042a 1286 struct inet6_ifaddr *ifp;
c2e21293 1287 struct hlist_node *node;
3a88a81d 1288 unsigned int hash = ipv6_addr_hash(addr);
1da177e4 1289
5c578aed 1290 rcu_read_lock_bh();
1291 hlist_for_each_entry_rcu(ifp, node, &inet6_addr_lst[hash], addr_lst) {
878628fb 1292 if (!net_eq(dev_net(ifp->idev->dev), net))
bfeade08 1293 continue;
1da177e4 1294 if (ipv6_addr_equal(&ifp->addr, addr) &&
eedf042a
SH		 1295 !(ifp->flags&IFA_F_TENTATIVE) &&
1296 (dev == NULL || ifp->idev->dev == dev ||
1297 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1298 rcu_read_unlock_bh();
1299 return 1;
1da177e4
LT		 1300 }
1301 }
5c578aed 1302
eedf042a
SH		 1303 rcu_read_unlock_bh();
1304 return 0;
1da177e4 1305}
7159039a
YH		 1306EXPORT_SYMBOL(ipv6_chk_addr);
1307
3e81c6da
DM		 1308static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1309 struct net_device *dev)
1da177e4 1310{
3e81c6da 1311 unsigned int hash = ipv6_addr_hash(addr);
c2e21293 1312 struct inet6_ifaddr *ifp;
1313 struct hlist_node *node;
1da177e4 1314
c2e21293 1315 hlist_for_each_entry(ifp, node, &inet6_addr_lst[hash], addr_lst) {
878628fb 1316 if (!net_eq(dev_net(ifp->idev->dev), net))
06bfe655 1317 continue;
1da177e4
LT		 1318 if (ipv6_addr_equal(&ifp->addr, addr)) {
1319 if (dev == NULL || ifp->idev->dev == dev)
3e81c6da 1320 return true;
1da177e4
LT		 1321 }
1322 }
3e81c6da 1323 return false;
1da177e4
LT		 1324}
1325
52eeeb84
YH		 1326int ipv6_chk_prefix(struct in6_addr *addr, struct net_device *dev)
1327{
1328 struct inet6_dev *idev;
1329 struct inet6_ifaddr *ifa;
1330 int onlink;
1331
1332 onlink = 0;
1333 rcu_read_lock();
1334 idev = __in6_dev_get(dev);
1335 if (idev) {
1336 read_lock_bh(&idev->lock);
502a2ffd 1337 list_for_each_entry(ifa, &idev->addr_list, if_list) {
52eeeb84
YH		 1338 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1339 ifa->prefix_len);
1340 if (onlink)
1341 break;
1342 }
1343 read_unlock_bh(&idev->lock);
1344 }
1345 rcu_read_unlock();
1346 return onlink;
1347}
1348
1349EXPORT_SYMBOL(ipv6_chk_prefix);
1350
9acd9f3a 1351struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1cab3da6 1352 struct net_device *dev, int strict)
1da177e4 1353{
b79d1d54 1354 struct inet6_ifaddr *ifp, *result = NULL;
3a88a81d 1355 unsigned int hash = ipv6_addr_hash(addr);
b79d1d54 1356 struct hlist_node *node;
1da177e4 1357
5c578aed 1358 rcu_read_lock_bh();
4f70ecca 1359 hlist_for_each_entry_rcu_bh(ifp, node, &inet6_addr_lst[hash], addr_lst) {
878628fb 1360 if (!net_eq(dev_net(ifp->idev->dev), net))
1cab3da6 1361 continue;
1da177e4
LT		 1362 if (ipv6_addr_equal(&ifp->addr, addr)) {
1363 if (dev == NULL || ifp->idev->dev == dev ||
1364 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
b79d1d54 1365 result = ifp;
1da177e4
LT		 1366 in6_ifa_hold(ifp);
1367 break;
1368 }
1369 }
1370 }
5c578aed 1371 rcu_read_unlock_bh();
1da177e4 1372
b79d1d54 1373 return result;
1da177e4
LT		 1374}
1375
1da177e4
LT		 1376/* Gets referenced address, destroys ifaddr */
1377
cc411d0b 1378static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1da177e4 1379{
1da177e4
LT		 1380 if (ifp->flags&IFA_F_PERMANENT) {
1381 spin_lock_bh(&ifp->lock);
1382 addrconf_del_timer(ifp);
1383 ifp->flags |= IFA_F_TENTATIVE;
cc411d0b
BH		 1384 if (dad_failed)
1385 ifp->flags |= IFA_F_DADFAILED;
1da177e4 1386 spin_unlock_bh(&ifp->lock);
e2577a06
HX		 1387 if (dad_failed)
1388 ipv6_ifa_notify(0, ifp);
1da177e4
LT		 1389 in6_ifa_put(ifp);
1390#ifdef CONFIG_IPV6_PRIVACY
1391 } else if (ifp->flags&IFA_F_TEMPORARY) {
1392 struct inet6_ifaddr *ifpub;
1393 spin_lock_bh(&ifp->lock);
1394 ifpub = ifp->ifpub;
1395 if (ifpub) {
1396 in6_ifa_hold(ifpub);
1397 spin_unlock_bh(&ifp->lock);
1398 ipv6_create_tempaddr(ifpub, ifp);
1399 in6_ifa_put(ifpub);
1400 } else {
1401 spin_unlock_bh(&ifp->lock);
1402 }
1403 ipv6_del_addr(ifp);
1404#endif
1405 } else
1406 ipv6_del_addr(ifp);
1407}
1408
f2344a13
HX		 1409static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1410{
1411 int err = -ENOENT;
1412
1413 spin_lock(&ifp->state_lock);
1414 if (ifp->state == INET6_IFADDR_STATE_DAD) {
1415 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1416 err = 0;
1417 }
1418 spin_unlock(&ifp->state_lock);
1419
1420 return err;
1421}
1422
3c21edbd
YH		 1423void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1424{
1b34be74 1425 struct inet6_dev *idev = ifp->idev;
9bdd8d40 1426
f2344a13
HX		 1427 if (addrconf_dad_end(ifp))
1428 return;
1429
9bdd8d40 1430 if (net_ratelimit())
0522fea6
JR		 1431 printk(KERN_INFO "%s: IPv6 duplicate address %pI6c detected!\n",
1432 ifp->idev->dev->name, &ifp->addr);
9bdd8d40 1433
1b34be74
YH		 1434 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1435 struct in6_addr addr;
1436
1437 addr.s6_addr32[0] = htonl(0xfe800000);
1438 addr.s6_addr32[1] = 0;
1439
1440 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1441 ipv6_addr_equal(&ifp->addr, &addr)) {
1442 /* DAD failed for link-local based on MAC address */
1443 idev->cnf.disable_ipv6 = 1;
9bdd8d40
BH		 1444
1445 printk(KERN_INFO "%s: IPv6 being disabled!\n",
1446 ifp->idev->dev->name);
1b34be74
YH		 1447 }
1448 }
1449
cc411d0b 1450 addrconf_dad_stop(ifp, 1);
3c21edbd 1451}
1da177e4
LT		 1452
1453/* Join to solicited addr multicast group. */
1454
1455void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1456{
1457 struct in6_addr maddr;
1458
1459 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1460 return;
1461
1462 addrconf_addr_solict_mult(addr, &maddr);
1463 ipv6_dev_mc_inc(dev, &maddr);
1464}
1465
1466void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1467{
1468 struct in6_addr maddr;
1469
1470 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1471 return;
1472
1473 addrconf_addr_solict_mult(addr, &maddr);
1474 __ipv6_dev_mc_dec(idev, &maddr);
1475}
1476
20380731 1477static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 1478{
1479 struct in6_addr addr;
1480 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1481 if (ipv6_addr_any(&addr))
1482 return;
1483 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1484}
1485
20380731 1486static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 1487{
1488 struct in6_addr addr;
1489 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1490 if (ipv6_addr_any(&addr))
1491 return;
1492 __ipv6_dev_ac_dec(ifp->idev, &addr);
1493}
1494
073a8e0e
YH		 1495static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1496{
1497 if (dev->addr_len != ETH_ALEN)
1498 return -1;
1499 memcpy(eui, dev->dev_addr, 3);
1500 memcpy(eui + 5, dev->dev_addr + 3, 3);
1501
1502 /*
1503 * The zSeries OSA network cards can be shared among various
1504 * OS instances, but the OSA cards have only one MAC address.
1505 * This leads to duplicate address conflicts in conjunction
1506 * with IPv6 if more than one instance uses the same card.
1507 *
1508 * The driver for these cards can deliver a unique 16-bit
1509 * identifier for each instance sharing the same card. It is
1510 * placed instead of 0xFFFE in the interface identifier. The
1511 * "u" bit of the interface identifier is not inverted in this
1512 * case. Hence the resulting interface identifier has local
1513 * scope according to RFC2373.
1514 */
1515 if (dev->dev_id) {
1516 eui[3] = (dev->dev_id >> 8) & 0xFF;
1517 eui[4] = dev->dev_id & 0xFF;
1518 } else {
1519 eui[3] = 0xFF;
1520 eui[4] = 0xFE;
1521 eui[0] ^= 2;
1522 }
1523 return 0;
1524}
1525
1526static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1527{
1528 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1529 if (dev->addr_len != ARCNET_ALEN)
1530 return -1;
1531 memset(eui, 0, 7);
1532 eui[7] = *(u8*)dev->dev_addr;
1533 return 0;
1534}
1535
1536static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1537{
1538 if (dev->addr_len != INFINIBAND_ALEN)
1539 return -1;
1540 memcpy(eui, dev->dev_addr + 12, 8);
1541 eui[0] |= 2;
1542 return 0;
1543}
1544
dfd982ba
YH		 1545int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
1546{
9af28511
SH		 1547 if (addr == 0)
1548 return -1;
dfd982ba
YH		 1549 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1550 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1551 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1552 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1553 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1554 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1555 eui[1] = 0;
1556 eui[2] = 0x5E;
1557 eui[3] = 0xFE;
1558 memcpy(eui + 4, &addr, 4);
1559 return 0;
1560}
1561EXPORT_SYMBOL(__ipv6_isatap_ifid);
1562
1563static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1564{
1565 if (dev->priv_flags & IFF_ISATAP)
1566 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1567 return -1;
1568}
1569
1da177e4
LT		 1570static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1571{
1572 switch (dev->type) {
1573 case ARPHRD_ETHER:
1574 case ARPHRD_FDDI:
1575 case ARPHRD_IEEE802_TR:
073a8e0e 1576 return addrconf_ifid_eui48(eui, dev);
1da177e4 1577 case ARPHRD_ARCNET:
073a8e0e 1578 return addrconf_ifid_arcnet(eui, dev);
1da177e4 1579 case ARPHRD_INFINIBAND:
073a8e0e 1580 return addrconf_ifid_infiniband(eui, dev);
c7dc89c0 1581 case ARPHRD_SIT:
dfd982ba 1582 return addrconf_ifid_sit(eui, dev);
1da177e4
LT		 1583 }
1584 return -1;
1585}
1586
1587static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1588{
1589 int err = -1;
1590 struct inet6_ifaddr *ifp;
1591
1592 read_lock_bh(&idev->lock);
502a2ffd 1593 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1da177e4
LT		 1594 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1595 memcpy(eui, ifp->addr.s6_addr+8, 8);
1596 err = 0;
1597 break;
1598 }
1599 }
1600 read_unlock_bh(&idev->lock);
1601 return err;
1602}
1603
1604#ifdef CONFIG_IPV6_PRIVACY
1605/* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1606static int __ipv6_regen_rndid(struct inet6_dev *idev)
1607{
1da177e4 1608regen:
955189ef 1609 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1da177e4 1610 idev->rndid[0] &= ~0x02;
1da177e4
LT		 1611
1612 /*
1613 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1614 * check if generated address is not inappropriate
1615 *
1616 * - Reserved subnet anycast (RFC 2526)
1617 * 11111101 11....11 1xxxxxxx
c7dc89c0 1618 * - ISATAP (RFC4214) 6.1
1da177e4
LT		 1619 * 00-00-5E-FE-xx-xx-xx-xx
1620 * - value 0
1621 * - XXX: already assigned to an address on the device
1622 */
1ab1457c 1623 if (idev->rndid[0] == 0xfd &&
1da177e4
LT		 1624 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1625 (idev->rndid[7]&0x80))
1626 goto regen;
1627 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1628 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1629 goto regen;
1630 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1631 goto regen;
1632 }
1633
1634 return 0;
1635}
1636
1637static void ipv6_regen_rndid(unsigned long data)
1638{
1639 struct inet6_dev *idev = (struct inet6_dev *) data;
1640 unsigned long expires;
1641
8814c4b5 1642 rcu_read_lock_bh();
1da177e4
LT		 1643 write_lock_bh(&idev->lock);
1644
1645 if (idev->dead)
1646 goto out;
1647
1648 if (__ipv6_regen_rndid(idev) < 0)
1649 goto out;
1ab1457c 1650
1da177e4 1651 expires = jiffies +
1ab1457c 1652 idev->cnf.temp_prefered_lft * HZ -
1da177e4
LT		 1653 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor;
1654 if (time_before(expires, jiffies)) {
1655 printk(KERN_WARNING
1656 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1657 idev->dev->name);
1658 goto out;
1659 }
1660
1661 if (!mod_timer(&idev->regen_timer, expires))
1662 in6_dev_hold(idev);
1663
1664out:
1665 write_unlock_bh(&idev->lock);
8814c4b5 1666 rcu_read_unlock_bh();
1da177e4
LT		 1667 in6_dev_put(idev);
1668}
1669
1670static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1671 int ret = 0;
1672
1673 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1674 ret = __ipv6_regen_rndid(idev);
1675 return ret;
1676}
1677#endif
1678
1679/*
1680 * Add prefix route.
1681 */
1682
1683static void
1684addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
e431b8c0 1685 unsigned long expires, u32 flags)
1da177e4 1686{
86872cb5
TG		 1687 struct fib6_config cfg = {
1688 .fc_table = RT6_TABLE_PREFIX,
1689 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1690 .fc_ifindex = dev->ifindex,
1691 .fc_expires = expires,
1692 .fc_dst_len = plen,
1693 .fc_flags = RTF_UP | flags,
c346dca1 1694 .fc_nlinfo.nl_net = dev_net(dev),
f410a1fb 1695 .fc_protocol = RTPROT_KERNEL,
86872cb5 1696 };
1da177e4 1697
86872cb5 1698 ipv6_addr_copy(&cfg.fc_dst, pfx);
1da177e4
LT		 1699
1700 /* Prevent useless cloning on PtP SIT.
1701 This thing is done here expecting that the whole
1702 class of non-broadcast devices need not cloning.
1703 */
0be669bb 1704#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
86872cb5
TG		 1705 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1706 cfg.fc_flags |= RTF_NONEXTHOP;
0be669bb 1707#endif
1da177e4 1708
86872cb5 1709 ip6_route_add(&cfg);
1da177e4
LT		 1710}
1711
1712/* Create "default" multicast route to the interface */
1713
1714static void addrconf_add_mroute(struct net_device *dev)
1715{
86872cb5
TG		 1716 struct fib6_config cfg = {
1717 .fc_table = RT6_TABLE_LOCAL,
1718 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1719 .fc_ifindex = dev->ifindex,
1720 .fc_dst_len = 8,
1721 .fc_flags = RTF_UP,
c346dca1 1722 .fc_nlinfo.nl_net = dev_net(dev),
86872cb5
TG		 1723 };
1724
1725 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1726
1727 ip6_route_add(&cfg);
1da177e4
LT		 1728}
1729
0be669bb 1730#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 1731static void sit_route_add(struct net_device *dev)
1732{
86872cb5
TG		 1733 struct fib6_config cfg = {
1734 .fc_table = RT6_TABLE_MAIN,
1735 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1736 .fc_ifindex = dev->ifindex,
1737 .fc_dst_len = 96,
1738 .fc_flags = RTF_UP | RTF_NONEXTHOP,
c346dca1 1739 .fc_nlinfo.nl_net = dev_net(dev),
86872cb5 1740 };
1da177e4
LT		 1741
1742 /* prefix length - 96 bits "::d.d.d.d" */
86872cb5 1743 ip6_route_add(&cfg);
1da177e4 1744}
0be669bb 1745#endif
1da177e4
LT		 1746
1747static void addrconf_add_lroute(struct net_device *dev)
1748{
1749 struct in6_addr addr;
1750
1751 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
1752 addrconf_prefix_route(&addr, 64, dev, 0, 0);
1753}
1754
1755static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1756{
1757 struct inet6_dev *idev;
1758
1759 ASSERT_RTNL();
1760
e21e8467
SH		 1761 idev = ipv6_find_idev(dev);
1762 if (!idev)
64e724f6
BH		 1763 return ERR_PTR(-ENOBUFS);
1764
1765 if (idev->cnf.disable_ipv6)
1766 return ERR_PTR(-EACCES);
1da177e4
LT		 1767
1768 /* Add default multicast route */
1769 addrconf_add_mroute(dev);
1770
1771 /* Add link local route */
1772 addrconf_add_lroute(dev);
1773 return idev;
1774}
1775
1776void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1777{
1778 struct prefix_info *pinfo;
1779 __u32 valid_lft;
1780 __u32 prefered_lft;
1781 int addr_type;
1da177e4 1782 struct inet6_dev *in6_dev;
56d417b1 1783 struct net *net = dev_net(dev);
1da177e4
LT		 1784
1785 pinfo = (struct prefix_info *) opt;
1ab1457c 1786
1da177e4
LT		 1787 if (len < sizeof(struct prefix_info)) {
1788 ADBG(("addrconf: prefix option too short\n"));
1789 return;
1790 }
1ab1457c 1791
1da177e4
LT		 1792 /*
1793 * Validation checks ([ADDRCONF], page 19)
1794 */
1795
1796 addr_type = ipv6_addr_type(&pinfo->prefix);
1797
1798 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1799 return;
1800
1801 valid_lft = ntohl(pinfo->valid);
1802 prefered_lft = ntohl(pinfo->prefered);
1803
1804 if (prefered_lft > valid_lft) {
1805 if (net_ratelimit())
1806 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1807 return;
1808 }
1809
1810 in6_dev = in6_dev_get(dev);
1811
1812 if (in6_dev == NULL) {
1813 if (net_ratelimit())
1814 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1815 return;
1816 }
1817
1818 /*
1819 * Two things going on here:
1820 * 1) Add routes for on-link prefixes
1821 * 2) Configure prefixes with the auto flag set
1822 */
1823
4bed72e4
YH		 1824 if (pinfo->onlink) {
1825 struct rt6_info *rt;
1826 unsigned long rt_expires;
1827
6f704992
YH		 1828 /* Avoid arithmetic overflow. Really, we could
1829 * save rt_expires in seconds, likely valid_lft,
1830 * but it would require division in fib gc, that it
1831 * not good.
1832 */
4bed72e4
YH		 1833 if (HZ > USER_HZ)
1834 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
1835 else
1836 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
3dd4bc68 1837
4bed72e4
YH		 1838 if (addrconf_finite_timeout(rt_expires))
1839 rt_expires *= HZ;
1da177e4 1840
56d417b1 1841 rt = rt6_lookup(net, &pinfo->prefix, NULL,
6fda7350 1842 dev->ifindex, 1);
1da177e4 1843
2b5ead46 1844 if (rt && addrconf_is_prefix_route(rt)) {
6f704992
YH		 1845 /* Autoconf prefix route */
1846 if (valid_lft == 0) {
1847 ip6_del_rt(rt);
1848 rt = NULL;
4bed72e4 1849 } else if (addrconf_finite_timeout(rt_expires)) {
6f704992
YH		 1850 /* not infinity */
1851 rt->rt6i_expires = jiffies + rt_expires;
1852 rt->rt6i_flags |= RTF_EXPIRES;
1853 } else {
1854 rt->rt6i_flags &= ~RTF_EXPIRES;
1855 rt->rt6i_expires = 0;
1da177e4
LT		 1856 }
1857 } else if (valid_lft) {
6f704992 1858 clock_t expires = 0;
4bed72e4
YH		 1859 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
1860 if (addrconf_finite_timeout(rt_expires)) {
6f704992
YH		 1861 /* not infinity */
1862 flags |= RTF_EXPIRES;
1863 expires = jiffies_to_clock_t(rt_expires);
1864 }
1da177e4 1865 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
6f704992 1866 dev, expires, flags);
1da177e4
LT		 1867 }
1868 if (rt)
1869 dst_release(&rt->u.dst);
1870 }
1871
1872 /* Try to figure out our local address for this prefix */
1873
1874 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1875 struct inet6_ifaddr * ifp;
1876 struct in6_addr addr;
1877 int create = 0, update_lft = 0;
1878
1879 if (pinfo->prefix_len == 64) {
1880 memcpy(&addr, &pinfo->prefix, 8);
1881 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1882 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1883 in6_dev_put(in6_dev);
1884 return;
1885 }
1886 goto ok;
1887 }
1888 if (net_ratelimit())
1889 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1890 pinfo->prefix_len);
1891 in6_dev_put(in6_dev);
1892 return;
1893
1894ok:
1895
53b7997f 1896 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
1da177e4
LT		 1897
1898 if (ifp == NULL && valid_lft) {
1899 int max_addresses = in6_dev->cnf.max_addresses;
95c385b4
NH		 1900 u32 addr_flags = 0;
1901
1902#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1903 if (in6_dev->cnf.optimistic_dad &&
53b7997f 1904 !net->ipv6.devconf_all->forwarding)
95c385b4
NH		 1905 addr_flags = IFA_F_OPTIMISTIC;
1906#endif
1da177e4
LT		 1907
1908 /* Do not allow to create too much of autoconfigured
1909 * addresses; this would be too easy way to crash kernel.
1910 */
1911 if (!max_addresses ||
1912 ipv6_count_addresses(in6_dev) < max_addresses)
1913 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
95c385b4
NH		 1914 addr_type&IPV6_ADDR_SCOPE_MASK,
1915 addr_flags);
1da177e4
LT		 1916
1917 if (!ifp || IS_ERR(ifp)) {
1918 in6_dev_put(in6_dev);
1919 return;
1920 }
1921
1922 update_lft = create = 1;
1923 ifp->cstamp = jiffies;
1924 addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1925 }
1926
1927 if (ifp) {
1928 int flags;
1929 unsigned long now;
1930#ifdef CONFIG_IPV6_PRIVACY
1931 struct inet6_ifaddr *ift;
1932#endif
1933 u32 stored_lft;
1934
1935 /* update lifetime (RFC2462 5.5.3 e) */
1936 spin_lock(&ifp->lock);
1937 now = jiffies;
1938 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1939 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1940 else
1941 stored_lft = 0;
1942 if (!update_lft && stored_lft) {
1943 if (valid_lft > MIN_VALID_LIFETIME ||
1944 valid_lft > stored_lft)
1945 update_lft = 1;
1946 else if (stored_lft <= MIN_VALID_LIFETIME) {
1947 /* valid_lft <= stored_lft is always true */
a1ed0526
BH		 1948 /*
1949 * RFC 4862 Section 5.5.3e:
1950 * "Note that the preferred lifetime of
1951 * the corresponding address is always
1952 * reset to the Preferred Lifetime in
1953 * the received Prefix Information
1954 * option, regardless of whether the
1955 * valid lifetime is also reset or
1956 * ignored."
1957 *
1958 * So if the preferred lifetime in
1959 * this advertisement is different
1960 * than what we have stored, but the
1961 * valid lifetime is invalid, just
1962 * reset prefered_lft.
1963 *
1964 * We must set the valid lifetime
1965 * to the stored lifetime since we'll
1966 * be updating the timestamp below,
1967 * else we'll set it back to the
1968 * minumum.
1969 */
1970 if (prefered_lft != ifp->prefered_lft) {
1971 valid_lft = stored_lft;
1972 update_lft = 1;
1973 }
1da177e4
LT		 1974 } else {
1975 valid_lft = MIN_VALID_LIFETIME;
1976 if (valid_lft < prefered_lft)
1977 prefered_lft = valid_lft;
1978 update_lft = 1;
1979 }
1980 }
1981
1982 if (update_lft) {
1983 ifp->valid_lft = valid_lft;
1984 ifp->prefered_lft = prefered_lft;
1985 ifp->tstamp = now;
1986 flags = ifp->flags;
1987 ifp->flags &= ~IFA_F_DEPRECATED;
1988 spin_unlock(&ifp->lock);
1989
1990 if (!(flags&IFA_F_TENTATIVE))
1991 ipv6_ifa_notify(0, ifp);
1992 } else
1993 spin_unlock(&ifp->lock);
1994
1995#ifdef CONFIG_IPV6_PRIVACY
1996 read_lock_bh(&in6_dev->lock);
1997 /* update all temporary addresses in the list */
372e6c8f 1998 list_for_each_entry(ift, &in6_dev->tempaddr_list, tmp_list) {
1da177e4
LT		 1999 /*
2000 * When adjusting the lifetimes of an existing
2001 * temporary address, only lower the lifetimes.
2002 * Implementations must not increase the
2003 * lifetimes of an existing temporary address
2004 * when processing a Prefix Information Option.
2005 */
c6fbfac2
BB		 2006 if (ifp != ift->ifpub)
2007 continue;
2008
1da177e4
LT		 2009 spin_lock(&ift->lock);
2010 flags = ift->flags;
2011 if (ift->valid_lft > valid_lft &&
2012 ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
2013 ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
2014 if (ift->prefered_lft > prefered_lft &&
2015 ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
2016 ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
2017 spin_unlock(&ift->lock);
2018 if (!(flags&IFA_F_TENTATIVE))
2019 ipv6_ifa_notify(0, ift);
2020 }
2021
2022 if (create && in6_dev->cnf.use_tempaddr > 0) {
2023 /*
2024 * When a new public address is created as described in [ADDRCONF],
2025 * also create a new temporary address.
2026 */
1ab1457c 2027 read_unlock_bh(&in6_dev->lock);
1da177e4
LT		 2028 ipv6_create_tempaddr(ifp, NULL);
2029 } else {
2030 read_unlock_bh(&in6_dev->lock);
2031 }
2032#endif
2033 in6_ifa_put(ifp);
2034 addrconf_verify(0);
2035 }
2036 }
2037 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2038 in6_dev_put(in6_dev);
2039}
2040
2041/*
2042 * Set destination address.
2043 * Special case for SIT interfaces where we create a new "virtual"
2044 * device.
2045 */
af284937 2046int addrconf_set_dstaddr(struct net *net, void __user *arg)
1da177e4
LT		 2047{
2048 struct in6_ifreq ireq;
2049 struct net_device *dev;
2050 int err = -EINVAL;
2051
2052 rtnl_lock();
2053
2054 err = -EFAULT;
2055 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2056 goto err_exit;
2057
af284937 2058 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
1da177e4
LT		 2059
2060 err = -ENODEV;
2061 if (dev == NULL)
2062 goto err_exit;
2063
0be669bb 2064#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4 2065 if (dev->type == ARPHRD_SIT) {
5bc3eb7e 2066 const struct net_device_ops *ops = dev->netdev_ops;
1da177e4 2067 struct ifreq ifr;
1da177e4
LT		 2068 struct ip_tunnel_parm p;
2069
2070 err = -EADDRNOTAVAIL;
2071 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2072 goto err_exit;
2073
2074 memset(&p, 0, sizeof(p));
2075 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2076 p.iph.saddr = 0;
2077 p.iph.version = 4;
2078 p.iph.ihl = 5;
2079 p.iph.protocol = IPPROTO_IPV6;
2080 p.iph.ttl = 64;
d20b3109 2081 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
1da177e4 2082
5bc3eb7e
SH		 2083 if (ops->ndo_do_ioctl) {
2084 mm_segment_t oldfs = get_fs();
2085
2086 set_fs(KERNEL_DS);
2087 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2088 set_fs(oldfs);
2089 } else
2090 err = -EOPNOTSUPP;
1da177e4
LT		 2091
2092 if (err == 0) {
2093 err = -ENOBUFS;
af284937
DL		 2094 dev = __dev_get_by_name(net, p.name);
2095 if (!dev)
1da177e4
LT		 2096 goto err_exit;
2097 err = dev_open(dev);
2098 }
2099 }
0be669bb 2100#endif
1da177e4
LT		 2101
2102err_exit:
2103 rtnl_unlock();
2104 return err;
2105}
2106
2107/*
2108 * Manual configuration of address on an interface
2109 */
af284937 2110static int inet6_addr_add(struct net *net, int ifindex, struct in6_addr *pfx,
24ef0da7 2111 unsigned int plen, __u8 ifa_flags, __u32 prefered_lft,
af284937 2112 __u32 valid_lft)
1da177e4
LT		 2113{
2114 struct inet6_ifaddr *ifp;
2115 struct inet6_dev *idev;
2116 struct net_device *dev;
2117 int scope;
6f704992
YH		 2118 u32 flags;
2119 clock_t expires;
4bed72e4 2120 unsigned long timeout;
1da177e4
LT		 2121
2122 ASSERT_RTNL();
1ab1457c 2123
24ef0da7
TG		 2124 if (plen > 128)
2125 return -EINVAL;
2126
0778769d
NT		 2127 /* check the lifetime */
2128 if (!valid_lft || prefered_lft > valid_lft)
2129 return -EINVAL;
2130
af284937
DL		 2131 dev = __dev_get_by_index(net, ifindex);
2132 if (!dev)
1da177e4 2133 return -ENODEV;
1ab1457c 2134
64e724f6
BH		 2135 idev = addrconf_add_dev(dev);
2136 if (IS_ERR(idev))
2137 return PTR_ERR(idev);
1da177e4
LT		 2138
2139 scope = ipv6_addr_scope(pfx);
2140
4bed72e4
YH		 2141 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2142 if (addrconf_finite_timeout(timeout)) {
2143 expires = jiffies_to_clock_t(timeout * HZ);
2144 valid_lft = timeout;
6f704992 2145 flags = RTF_EXPIRES;
4bed72e4
YH		 2146 } else {
2147 expires = 0;
2148 flags = 0;
2149 ifa_flags |= IFA_F_PERMANENT;
6f704992 2150 }
0778769d 2151
4bed72e4
YH		 2152 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2153 if (addrconf_finite_timeout(timeout)) {
2154 if (timeout == 0)
2155 ifa_flags |= IFA_F_DEPRECATED;
2156 prefered_lft = timeout;
2157 }
0778769d
NT		 2158
2159 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
2160
1da177e4 2161 if (!IS_ERR(ifp)) {
06aebfb7 2162 spin_lock_bh(&ifp->lock);
0778769d
NT		 2163 ifp->valid_lft = valid_lft;
2164 ifp->prefered_lft = prefered_lft;
2165 ifp->tstamp = jiffies;
06aebfb7 2166 spin_unlock_bh(&ifp->lock);
0778769d 2167
46d48046 2168 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
6f704992 2169 expires, flags);
95c385b4
NH		 2170 /*
2171 * Note that section 3.1 of RFC 4429 indicates
2172 * that the Optimistic flag should not be set for
2173 * manually configured addresses
2174 */
1da177e4
LT		 2175 addrconf_dad_start(ifp, 0);
2176 in6_ifa_put(ifp);
0778769d 2177 addrconf_verify(0);
1da177e4
LT		 2178 return 0;
2179 }
2180
2181 return PTR_ERR(ifp);
2182}
2183
af284937 2184static int inet6_addr_del(struct net *net, int ifindex, struct in6_addr *pfx,
24ef0da7 2185 unsigned int plen)
1da177e4
LT		 2186{
2187 struct inet6_ifaddr *ifp;
2188 struct inet6_dev *idev;
2189 struct net_device *dev;
1ab1457c 2190
24ef0da7
TG		 2191 if (plen > 128)
2192 return -EINVAL;
2193
af284937
DL		 2194 dev = __dev_get_by_index(net, ifindex);
2195 if (!dev)
1da177e4
LT		 2196 return -ENODEV;
2197
2198 if ((idev = __in6_dev_get(dev)) == NULL)
2199 return -ENXIO;
2200
2201 read_lock_bh(&idev->lock);
502a2ffd 2202 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1da177e4
LT		 2203 if (ifp->prefix_len == plen &&
2204 ipv6_addr_equal(pfx, &ifp->addr)) {
2205 in6_ifa_hold(ifp);
2206 read_unlock_bh(&idev->lock);
1ab1457c 2207
1da177e4
LT		 2208 ipv6_del_addr(ifp);
2209
2210 /* If the last address is deleted administratively,
2211 disable IPv6 on this interface.
2212 */
502a2ffd 2213 if (list_empty(&idev->addr_list))
1da177e4
LT		 2214 addrconf_ifdown(idev->dev, 1);
2215 return 0;
2216 }
2217 }
2218 read_unlock_bh(&idev->lock);
2219 return -EADDRNOTAVAIL;
2220}
2221
2222
af284937 2223int addrconf_add_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2224{
2225 struct in6_ifreq ireq;
2226 int err;
1ab1457c 2227
1da177e4
LT		 2228 if (!capable(CAP_NET_ADMIN))
2229 return -EPERM;
1ab1457c 2230
1da177e4
LT		 2231 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2232 return -EFAULT;
2233
2234 rtnl_lock();
af284937
DL		 2235 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2236 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2237 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1da177e4
LT		 2238 rtnl_unlock();
2239 return err;
2240}
2241
af284937 2242int addrconf_del_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2243{
2244 struct in6_ifreq ireq;
2245 int err;
1ab1457c 2246
1da177e4
LT		 2247 if (!capable(CAP_NET_ADMIN))
2248 return -EPERM;
2249
2250 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2251 return -EFAULT;
2252
2253 rtnl_lock();
af284937
DL		 2254 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2255 ireq.ifr6_prefixlen);
1da177e4
LT		 2256 rtnl_unlock();
2257 return err;
2258}
2259
b5f348e5
IJ		 2260static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2261 int plen, int scope)
2262{
2263 struct inet6_ifaddr *ifp;
2264
2265 ifp = ipv6_add_addr(idev, addr, plen, scope, IFA_F_PERMANENT);
2266 if (!IS_ERR(ifp)) {
2267 spin_lock_bh(&ifp->lock);
2268 ifp->flags &= ~IFA_F_TENTATIVE;
2269 spin_unlock_bh(&ifp->lock);
2270 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2271 in6_ifa_put(ifp);
2272 }
2273}
2274
0be669bb 2275#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 2276static void sit_add_v4_addrs(struct inet6_dev *idev)
2277{
1da177e4
LT		 2278 struct in6_addr addr;
2279 struct net_device *dev;
c346dca1 2280 struct net *net = dev_net(idev->dev);
1da177e4
LT		 2281 int scope;
2282
2283 ASSERT_RTNL();
2284
2285 memset(&addr, 0, sizeof(struct in6_addr));
2286 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2287
2288 if (idev->dev->flags&IFF_POINTOPOINT) {
2289 addr.s6_addr32[0] = htonl(0xfe800000);
2290 scope = IFA_LINK;
2291 } else {
2292 scope = IPV6_ADDR_COMPATv4;
2293 }
2294
2295 if (addr.s6_addr32[3]) {
b5f348e5 2296 add_addr(idev, &addr, 128, scope);
1da177e4
LT		 2297 return;
2298 }
2299
6fda7350 2300 for_each_netdev(net, dev) {
e5ed6399 2301 struct in_device * in_dev = __in_dev_get_rtnl(dev);
1da177e4
LT		 2302 if (in_dev && (dev->flags & IFF_UP)) {
2303 struct in_ifaddr * ifa;
2304
2305 int flag = scope;
2306
2307 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2308 int plen;
2309
2310 addr.s6_addr32[3] = ifa->ifa_local;
2311
2312 if (ifa->ifa_scope == RT_SCOPE_LINK)
2313 continue;
2314 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2315 if (idev->dev->flags&IFF_POINTOPOINT)
2316 continue;
2317 flag |= IFA_HOST;
2318 }
2319 if (idev->dev->flags&IFF_POINTOPOINT)
2320 plen = 64;
2321 else
2322 plen = 96;
2323
b5f348e5 2324 add_addr(idev, &addr, plen, flag);
1da177e4
LT		 2325 }
2326 }
1ab1457c 2327 }
1da177e4 2328}
0be669bb 2329#endif
1da177e4
LT		 2330
2331static void init_loopback(struct net_device *dev)
2332{
2333 struct inet6_dev *idev;
1da177e4
LT		 2334
2335 /* ::1 */
2336
2337 ASSERT_RTNL();
2338
2339 if ((idev = ipv6_find_idev(dev)) == NULL) {
2340 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2341 return;
2342 }
2343
b5f348e5 2344 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
1da177e4
LT		 2345}
2346
2347static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
2348{
2349 struct inet6_ifaddr * ifp;
95c385b4
NH		 2350 u32 addr_flags = IFA_F_PERMANENT;
2351
2352#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2353 if (idev->cnf.optimistic_dad &&
702beb87 2354 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
95c385b4
NH		 2355 addr_flags |= IFA_F_OPTIMISTIC;
2356#endif
1da177e4 2357
95c385b4
NH		 2358
2359 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
1da177e4 2360 if (!IS_ERR(ifp)) {
46d48046 2361 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
1da177e4
LT		 2362 addrconf_dad_start(ifp, 0);
2363 in6_ifa_put(ifp);
2364 }
2365}
2366
2367static void addrconf_dev_config(struct net_device *dev)
2368{
2369 struct in6_addr addr;
2370 struct inet6_dev * idev;
2371
2372 ASSERT_RTNL();
2373
74235a25
HX		 2374 if ((dev->type != ARPHRD_ETHER) &&
2375 (dev->type != ARPHRD_FDDI) &&
2376 (dev->type != ARPHRD_IEEE802_TR) &&
2377 (dev->type != ARPHRD_ARCNET) &&
2378 (dev->type != ARPHRD_INFINIBAND)) {
2379 /* Alas, we support only Ethernet autoconfiguration. */
2380 return;
2381 }
2382
1da177e4 2383 idev = addrconf_add_dev(dev);
64e724f6 2384 if (IS_ERR(idev))
1da177e4
LT		 2385 return;
2386
2387 memset(&addr, 0, sizeof(struct in6_addr));
2388 addr.s6_addr32[0] = htonl(0xFE800000);
2389
2390 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2391 addrconf_add_linklocal(idev, &addr);
2392}
2393
0be669bb 2394#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 2395static void addrconf_sit_config(struct net_device *dev)
2396{
2397 struct inet6_dev *idev;
2398
2399 ASSERT_RTNL();
2400
1ab1457c
YH		 2401 /*
2402 * Configure the tunnel with one of our IPv4
2403 * addresses... we should configure all of
1da177e4
LT		 2404 * our v4 addrs in the tunnel
2405 */
2406
2407 if ((idev = ipv6_find_idev(dev)) == NULL) {
2408 printk(KERN_DEBUG "init sit: add_dev failed\n");
2409 return;
2410 }
2411
c7dc89c0
FT		 2412 if (dev->priv_flags & IFF_ISATAP) {
2413 struct in6_addr addr;
2414
2415 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2416 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2417 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2418 addrconf_add_linklocal(idev, &addr);
2419 return;
2420 }
2421
1da177e4
LT		 2422 sit_add_v4_addrs(idev);
2423
2424 if (dev->flags&IFF_POINTOPOINT) {
2425 addrconf_add_mroute(dev);
2426 addrconf_add_lroute(dev);
2427 } else
2428 sit_route_add(dev);
2429}
0be669bb 2430#endif
1da177e4
LT		 2431
2432static inline int
2433ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2434{
2435 struct in6_addr lladdr;
2436
95c385b4 2437 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
1da177e4
LT		 2438 addrconf_add_linklocal(idev, &lladdr);
2439 return 0;
2440 }
2441 return -1;
2442}
2443
2444static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2445{
2446 struct net_device *link_dev;
c346dca1 2447 struct net *net = dev_net(idev->dev);
1da177e4
LT		 2448
2449 /* first try to inherit the link-local address from the link device */
2450 if (idev->dev->iflink &&
6fda7350 2451 (link_dev = __dev_get_by_index(net, idev->dev->iflink))) {
1da177e4
LT		 2452 if (!ipv6_inherit_linklocal(idev, link_dev))
2453 return;
2454 }
2455 /* then try to inherit it from any device */
6fda7350 2456 for_each_netdev(net, link_dev) {
1da177e4
LT		 2457 if (!ipv6_inherit_linklocal(idev, link_dev))
2458 return;
2459 }
2460 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2461}
2462
2463/*
2464 * Autoconfigure tunnel with a link-local address so routing protocols,
2465 * DHCPv6, MLD etc. can be run over the virtual link
2466 */
2467
2468static void addrconf_ip6_tnl_config(struct net_device *dev)
2469{
2470 struct inet6_dev *idev;
2471
2472 ASSERT_RTNL();
2473
e21e8467 2474 idev = addrconf_add_dev(dev);
64e724f6 2475 if (IS_ERR(idev)) {
1da177e4
LT		 2476 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2477 return;
2478 }
2479 ip6_tnl_add_linklocal(idev);
1da177e4
LT		 2480}
2481
1ab1457c 2482static int addrconf_notify(struct notifier_block *this, unsigned long event,
1da177e4
LT		 2483 void * data)
2484{
2485 struct net_device *dev = (struct net_device *) data;
74235a25 2486 struct inet6_dev *idev = __in6_dev_get(dev);
c5e33bdd 2487 int run_pending = 0;
b217d616 2488 int err;
1da177e4 2489
e21e8467 2490 switch (event) {
45ba9dd2 2491 case NETDEV_REGISTER:
74235a25 2492 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
45ba9dd2
YH		 2493 idev = ipv6_add_dev(dev);
2494 if (!idev)
b217d616 2495 return notifier_from_errno(-ENOMEM);
45ba9dd2
YH		 2496 }
2497 break;
bcdd553f 2498
1da177e4 2499 case NETDEV_UP:
3c21edbd 2500 case NETDEV_CHANGE:
c2edacf8
JV		 2501 if (dev->flags & IFF_SLAVE)
2502 break;
2503
3c21edbd 2504 if (event == NETDEV_UP) {
f24e3d65 2505 if (!addrconf_qdisc_ok(dev)) {
3c21edbd
YH		 2506 /* device is not ready yet. */
2507 printk(KERN_INFO
2508 "ADDRCONF(NETDEV_UP): %s: "
2509 "link is not ready\n",
2510 dev->name);
2511 break;
2512 }
99081049 2513
d31c7b8f
EP		 2514 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2515 idev = ipv6_add_dev(dev);
2516
e3ec6cfc 2517 if (idev) {
99081049 2518 idev->if_flags |= IF_READY;
e3ec6cfc
BT		 2519 run_pending = 1;
2520 }
3c21edbd 2521 } else {
f24e3d65 2522 if (!addrconf_qdisc_ok(dev)) {
3c21edbd
YH		 2523 /* device is still not ready. */
2524 break;
2525 }
2526
2527 if (idev) {
bcdd553f 2528 if (idev->if_flags & IF_READY)
3c21edbd
YH		 2529 /* device is already configured. */
2530 break;
3c21edbd
YH		 2531 idev->if_flags |= IF_READY;
2532 }
2533
2534 printk(KERN_INFO
2535 "ADDRCONF(NETDEV_CHANGE): %s: "
2536 "link becomes ready\n",
2537 dev->name);
2538
c5e33bdd 2539 run_pending = 1;
3c21edbd
YH		 2540 }
2541
e21e8467 2542 switch (dev->type) {
0be669bb 2543#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 2544 case ARPHRD_SIT:
2545 addrconf_sit_config(dev);
2546 break;
0be669bb 2547#endif
1da177e4
LT		 2548 case ARPHRD_TUNNEL6:
2549 addrconf_ip6_tnl_config(dev);
2550 break;
2551 case ARPHRD_LOOPBACK:
2552 init_loopback(dev);
2553 break;
2554
2555 default:
2556 addrconf_dev_config(dev);
2557 break;
3ff50b79 2558 }
bcdd553f 2559
1da177e4 2560 if (idev) {
c5e33bdd
YH		 2561 if (run_pending)
2562 addrconf_dad_run(idev);
2563
bcdd553f
SH		 2564 /*
2565 * If the MTU changed during the interface down,
2566 * when the interface up, the changed MTU must be
2567 * reflected in the idev as well as routers.
1da177e4 2568 */
bcdd553f
SH		 2569 if (idev->cnf.mtu6 != dev->mtu &&
2570 dev->mtu >= IPV6_MIN_MTU) {
1da177e4
LT		 2571 rt6_mtu_change(dev, dev->mtu);
2572 idev->cnf.mtu6 = dev->mtu;
2573 }
2574 idev->tstamp = jiffies;
2575 inet6_ifinfo_notify(RTM_NEWLINK, idev);
bcdd553f
SH		 2576
2577 /*
2578 * If the changed mtu during down is lower than
2579 * IPV6_MIN_MTU stop IPv6 on this interface.
1da177e4
LT		 2580 */
2581 if (dev->mtu < IPV6_MIN_MTU)
bcdd553f 2582 addrconf_ifdown(dev, 1);
1da177e4
LT		 2583 }
2584 break;
2585
2586 case NETDEV_CHANGEMTU:
d31c7b8f 2587 if (idev && dev->mtu >= IPV6_MIN_MTU) {
1da177e4
LT		 2588 rt6_mtu_change(dev, dev->mtu);
2589 idev->cnf.mtu6 = dev->mtu;
2590 break;
2591 }
2592
d31c7b8f
EP		 2593 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2594 idev = ipv6_add_dev(dev);
2595 if (idev)
2596 break;
2597 }
2598
bcdd553f
SH		 2599 /*
2600 * MTU falled under IPV6_MIN_MTU.
2601 * Stop IPv6 on this interface.
2602 */
1da177e4
LT		 2603
2604 case NETDEV_DOWN:
2605 case NETDEV_UNREGISTER:
2606 /*
2607 * Remove all addresses from this interface.
2608 */
2609 addrconf_ifdown(dev, event != NETDEV_DOWN);
2610 break;
3c21edbd 2611
1da177e4 2612 case NETDEV_CHANGENAME:
1da177e4 2613 if (idev) {
5632c515 2614 snmp6_unregister_dev(idev);
408c4768 2615 addrconf_sysctl_unregister(idev);
f52295a9 2616 addrconf_sysctl_register(idev);
b217d616
HX		 2617 err = snmp6_register_dev(idev);
2618 if (err)
2619 return notifier_from_errno(err);
5632c515 2620 }
1da177e4 2621 break;
bcdd553f 2622
93d9b7d7
JP		 2623 case NETDEV_PRE_TYPE_CHANGE:
2624 case NETDEV_POST_TYPE_CHANGE:
2625 addrconf_type_change(dev, event);
75c78500 2626 break;
3ff50b79 2627 }
1da177e4
LT		 2628
2629 return NOTIFY_OK;
2630}
2631
2632/*
2633 * addrconf module should be notified of a device going up
2634 */
2635static struct notifier_block ipv6_dev_notf = {
2636 .notifier_call = addrconf_notify,
1da177e4
LT		 2637};
2638
93d9b7d7 2639static void addrconf_type_change(struct net_device *dev, unsigned long event)
75c78500
MS		 2640{
2641 struct inet6_dev *idev;
2642 ASSERT_RTNL();
2643
2644 idev = __in6_dev_get(dev);
2645
93d9b7d7 2646 if (event == NETDEV_POST_TYPE_CHANGE)
75c78500 2647 ipv6_mc_remap(idev);
93d9b7d7 2648 else if (event == NETDEV_PRE_TYPE_CHANGE)
75c78500
MS		 2649 ipv6_mc_unmap(idev);
2650}
2651
1da177e4
LT		 2652static int addrconf_ifdown(struct net_device *dev, int how)
2653{
c346dca1 2654 struct net *net = dev_net(dev);
502a2ffd 2655 struct inet6_dev *idev;
2656 struct inet6_ifaddr *ifa;
2657 LIST_HEAD(keep_list);
4c5ff6a6 2658 int state;
1da177e4
LT		 2659
2660 ASSERT_RTNL();
2661
f3db4851 2662 rt6_ifdown(net, dev);
1da177e4
LT		 2663 neigh_ifdown(&nd_tbl, dev);
2664
2665 idev = __in6_dev_get(dev);
2666 if (idev == NULL)
2667 return -ENODEV;
2668
bcdd553f
SH		 2669 /*
2670 * Step 1: remove reference to ipv6 device from parent device.
2671 * Do not dev_put!
1da177e4 2672 */
439e2385 2673 if (how) {
1da177e4 2674 idev->dead = 1;
8814c4b5
YH		 2675
2676 /* protected by rtnl_lock */
2677 rcu_assign_pointer(dev->ip6_ptr, NULL);
1da177e4
LT		 2678
2679 /* Step 1.5: remove snmp6 entry */
2680 snmp6_unregister_dev(idev);
2681
2682 }
2683
1da177e4
LT		 2684 write_lock_bh(&idev->lock);
2685
bcdd553f 2686 /* Step 2: clear flags for stateless addrconf */
439e2385 2687 if (!how)
3c21edbd 2688 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
1da177e4 2689
1da177e4 2690#ifdef CONFIG_IPV6_PRIVACY
439e2385 2691 if (how && del_timer(&idev->regen_timer))
1da177e4
LT		 2692 in6_dev_put(idev);
2693
bcdd553f 2694 /* Step 3: clear tempaddr list */
372e6c8f 2695 while (!list_empty(&idev->tempaddr_list)) {
2696 ifa = list_first_entry(&idev->tempaddr_list,
2697 struct inet6_ifaddr, tmp_list);
2698 list_del(&ifa->tmp_list);
1da177e4
LT		 2699 write_unlock_bh(&idev->lock);
2700 spin_lock_bh(&ifa->lock);
2701
2702 if (ifa->ifpub) {
2703 in6_ifa_put(ifa->ifpub);
2704 ifa->ifpub = NULL;
2705 }
2706 spin_unlock_bh(&ifa->lock);
2707 in6_ifa_put(ifa);
2708 write_lock_bh(&idev->lock);
2709 }
2710#endif
8f37ada5 2711
502a2ffd 2712 while (!list_empty(&idev->addr_list)) {
2713 ifa = list_first_entry(&idev->addr_list,
2714 struct inet6_ifaddr, if_list);
84e8b803 2715 addrconf_del_timer(ifa);
2716
2717 /* If just doing link down, and address is permanent
2718 and not link-local, then retain it. */
bcdd553f 2719 if (!how &&
84e8b803 2720 (ifa->flags&IFA_F_PERMANENT) &&
2721 !(ipv6_addr_type(&ifa->addr) & IPV6_ADDR_LINKLOCAL)) {
502a2ffd 2722 list_move_tail(&ifa->if_list, &keep_list);
dc2b99f7 2723
84e8b803 2724 /* If not doing DAD on this address, just keep it. */
2725 if ((dev->flags&(IFF_NOARP|IFF_LOOPBACK)) ||
2726 idev->cnf.accept_dad <= 0 ||
2727 (ifa->flags & IFA_F_NODAD))
2728 continue;
2729
2730 /* If it was tentative already, no need to notify */
2731 if (ifa->flags & IFA_F_TENTATIVE)
2732 continue;
2733
2734 /* Flag it for later restoration when link comes up */
2735 ifa->flags |= IFA_F_TENTATIVE;
f2344a13 2736 ifa->state = INET6_IFADDR_STATE_DAD;
4c5ff6a6 2737
27bdb2ab 2738 write_unlock_bh(&idev->lock);
4c5ff6a6
HX		 2739
2740 in6_ifa_hold(ifa);
dc2b99f7 2741 } else {
502a2ffd 2742 list_del(&ifa->if_list);
1da177e4 2743
27bdb2ab 2744 /* clear hash table */
2745 spin_lock_bh(&addrconf_hash_lock);
2746 hlist_del_init_rcu(&ifa->addr_lst);
27bdb2ab 2747 spin_unlock_bh(&addrconf_hash_lock);
4c5ff6a6
HX		 2748
2749 write_unlock_bh(&idev->lock);
2750 spin_lock_bh(&ifa->state_lock);
2751 state = ifa->state;
2752 ifa->state = INET6_IFADDR_STATE_DEAD;
2753 spin_unlock_bh(&ifa->state_lock);
2754
2755 if (state == INET6_IFADDR_STATE_DEAD)
2756 goto put_ifa;
27bdb2ab 2757 }
c2e21293 2758
84e8b803 2759 __ipv6_ifa_notify(RTM_DELADDR, ifa);
e9d3e084 2760 if (ifa->state == INET6_IFADDR_STATE_DEAD)
8595805a 2761 atomic_notifier_call_chain(&inet6addr_chain,
2762 NETDEV_DOWN, ifa);
4c5ff6a6
HX		 2763
2764put_ifa:
84e8b803 2765 in6_ifa_put(ifa);
dc2b99f7 2766
84e8b803 2767 write_lock_bh(&idev->lock);
1da177e4 2768 }
8f37ada5 2769
502a2ffd 2770 list_splice(&keep_list, &idev->addr_list);
8f37ada5 2771
1da177e4
LT		 2772 write_unlock_bh(&idev->lock);
2773
2774 /* Step 5: Discard multicast list */
439e2385 2775 if (how)
1da177e4
LT		 2776 ipv6_mc_destroy_dev(idev);
2777 else
2778 ipv6_mc_down(idev);
2779
1da177e4 2780 idev->tstamp = jiffies;
1ab1457c 2781
bcdd553f 2782 /* Last: Shot the device (if unregistered) */
439e2385 2783 if (how) {
408c4768 2784 addrconf_sysctl_unregister(idev);
1da177e4
LT		 2785 neigh_parms_release(&nd_tbl, idev->nd_parms);
2786 neigh_ifdown(&nd_tbl, dev);
2787 in6_dev_put(idev);
2788 }
2789 return 0;
2790}
2791
2792static void addrconf_rs_timer(unsigned long data)
2793{
2794 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
5b2a1953 2795 struct inet6_dev *idev = ifp->idev;
1da177e4 2796
5b2a1953 2797 read_lock(&idev->lock);
2798 if (idev->dead || !(idev->if_flags & IF_READY))
1da177e4
LT		 2799 goto out;
2800
5b2a1953 2801 if (idev->cnf.forwarding)
2802 goto out;
2803
2804 /* Announcement received after solicitation was sent */
2805 if (idev->if_flags & IF_RA_RCVD)
1da177e4 2806 goto out;
1da177e4
LT		 2807
2808 spin_lock(&ifp->lock);
5b2a1953 2809 if (ifp->probes++ < idev->cnf.rtr_solicits) {
1da177e4
LT		 2810 /* The wait after the last probe can be shorter */
2811 addrconf_mod_timer(ifp, AC_RS,
5b2a1953 2812 (ifp->probes == idev->cnf.rtr_solicits) ?
2813 idev->cnf.rtr_solicit_delay :
2814 idev->cnf.rtr_solicit_interval);
1da177e4
LT		 2815 spin_unlock(&ifp->lock);
2816
5b2a1953 2817 ndisc_send_rs(idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
1da177e4
LT		 2818 } else {
2819 spin_unlock(&ifp->lock);
2820 /*
2821 * Note: we do not support deprecated "all on-link"
2822 * assumption any longer.
2823 */
2824 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
5b2a1953 2825 idev->dev->name);
1da177e4
LT		 2826 }
2827
2828out:
5b2a1953 2829 read_unlock(&idev->lock);
1da177e4
LT		 2830 in6_ifa_put(ifp);
2831}
2832
2833/*
2834 * Duplicate Address Detection
2835 */
3c21edbd
YH		 2836static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2837{
2838 unsigned long rand_num;
2839 struct inet6_dev *idev = ifp->idev;
2840
95c385b4
NH		 2841 if (ifp->flags & IFA_F_OPTIMISTIC)
2842 rand_num = 0;
2843 else
2844 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2845
3c21edbd
YH		 2846 ifp->probes = idev->cnf.dad_transmits;
2847 addrconf_mod_timer(ifp, AC_DAD, rand_num);
2848}
2849
e431b8c0 2850static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
1da177e4
LT		 2851{
2852 struct inet6_dev *idev = ifp->idev;
2853 struct net_device *dev = idev->dev;
1da177e4
LT		 2854
2855 addrconf_join_solict(dev, &ifp->addr);
2856
1da177e4 2857 net_srandom(ifp->addr.s6_addr32[3]);
1da177e4
LT		 2858
2859 read_lock_bh(&idev->lock);
622ccdf1 2860 spin_lock(&ifp->lock);
e9d3e084 2861 if (ifp->state == INET6_IFADDR_STATE_DEAD)
1da177e4 2862 goto out;
1da177e4
LT		 2863
2864 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
1b34be74 2865 idev->cnf.accept_dad < 1 ||
55ebaef1
NT		 2866 !(ifp->flags&IFA_F_TENTATIVE) ||
2867 ifp->flags & IFA_F_NODAD) {
cc411d0b 2868 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 2869 spin_unlock(&ifp->lock);
1da177e4
LT		 2870 read_unlock_bh(&idev->lock);
2871
2872 addrconf_dad_completed(ifp);
2873 return;
2874 }
2875
6732bade 2876 if (!(idev->if_flags & IF_READY)) {
21809faf 2877 spin_unlock(&ifp->lock);
6732bade 2878 read_unlock_bh(&idev->lock);
3c21edbd 2879 /*
590a9887 2880 * If the device is not ready:
3c21edbd
YH		 2881 * - keep it tentative if it is a permanent address.
2882 * - otherwise, kill it.
2883 */
2884 in6_ifa_hold(ifp);
cc411d0b 2885 addrconf_dad_stop(ifp, 0);
6732bade 2886 return;
3c21edbd 2887 }
95c385b4
NH		 2888
2889 /*
2890 * Optimistic nodes can start receiving
2891 * Frames right away
2892 */
e21e8467 2893 if (ifp->flags & IFA_F_OPTIMISTIC)
95c385b4
NH		 2894 ip6_ins_rt(ifp->rt);
2895
6732bade 2896 addrconf_dad_kick(ifp);
1da177e4 2897out:
622ccdf1 2898 spin_unlock(&ifp->lock);
1da177e4
LT		 2899 read_unlock_bh(&idev->lock);
2900}
2901
2902static void addrconf_dad_timer(unsigned long data)
2903{
2904 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2905 struct inet6_dev *idev = ifp->idev;
1da177e4
LT		 2906 struct in6_addr mcaddr;
2907
f2344a13
HX		 2908 if (!ifp->probes && addrconf_dad_end(ifp))
2909 goto out;
2910
122e4519 2911 read_lock(&idev->lock);
2912 if (idev->dead || !(idev->if_flags & IF_READY)) {
2913 read_unlock(&idev->lock);
1da177e4
LT		 2914 goto out;
2915 }
21809faf 2916
2917 spin_lock(&ifp->lock);
622ccdf1
HX		 2918 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
2919 spin_unlock(&ifp->lock);
2920 read_unlock(&idev->lock);
2921 goto out;
2922 }
2923
1da177e4
LT		 2924 if (ifp->probes == 0) {
2925 /*
2926 * DAD was successful
2927 */
2928
cc411d0b 2929 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 2930 spin_unlock(&ifp->lock);
122e4519 2931 read_unlock(&idev->lock);
1da177e4
LT		 2932
2933 addrconf_dad_completed(ifp);
2934
2935 goto out;
2936 }
2937
2938 ifp->probes--;
2939 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
21809faf 2940 spin_unlock(&ifp->lock);
122e4519 2941 read_unlock(&idev->lock);
1da177e4
LT		 2942
2943 /* send a neighbour solicitation for our addr */
1da177e4 2944 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
d7aabf22 2945 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
1da177e4
LT		 2946out:
2947 in6_ifa_put(ifp);
2948}
2949
2950static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2951{
e21e8467 2952 struct net_device *dev = ifp->idev->dev;
1da177e4
LT		 2953
2954 /*
2955 * Configure the address for reception. Now it is valid.
2956 */
2957
2958 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2959
2960 /* If added prefix is link local and forwarding is off,
2961 start sending router solicitations.
2962 */
2963
2964 if (ifp->idev->cnf.forwarding == 0 &&
2965 ifp->idev->cnf.rtr_solicits > 0 &&
2966 (dev->flags&IFF_LOOPBACK) == 0 &&
2967 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
1da177e4
LT		 2968 /*
2969 * If a host as already performed a random delay
2970 * [...] as part of DAD [...] there is no need
2971 * to delay again before sending the first RS
2972 */
f3ee4010 2973 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
1da177e4
LT		 2974
2975 spin_lock_bh(&ifp->lock);
2976 ifp->probes = 1;
2977 ifp->idev->if_flags |= IF_RS_SENT;
2978 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2979 spin_unlock_bh(&ifp->lock);
2980 }
2981}
2982
e21e8467
SH		 2983static void addrconf_dad_run(struct inet6_dev *idev)
2984{
c5e33bdd
YH		 2985 struct inet6_ifaddr *ifp;
2986
2987 read_lock_bh(&idev->lock);
502a2ffd 2988 list_for_each_entry(ifp, &idev->addr_list, if_list) {
21809faf 2989 spin_lock(&ifp->lock);
f2344a13
HX		 2990 if (ifp->flags & IFA_F_TENTATIVE &&
2991 ifp->state == INET6_IFADDR_STATE_DAD)
2992 addrconf_dad_kick(ifp);
21809faf 2993 spin_unlock(&ifp->lock);
c5e33bdd
YH		 2994 }
2995 read_unlock_bh(&idev->lock);
2996}
2997
1da177e4
LT		 2998#ifdef CONFIG_PROC_FS
2999struct if6_iter_state {
3c40090a 3000 struct seq_net_private p;
1da177e4
LT		 3001 int bucket;
3002};
3003
3004static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
3005{
3006 struct inet6_ifaddr *ifa = NULL;
3007 struct if6_iter_state *state = seq->private;
1218854a 3008 struct net *net = seq_file_net(seq);
1da177e4
LT		 3009
3010 for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
c2e21293 3011 struct hlist_node *n;
4f70ecca 3012 hlist_for_each_entry_rcu_bh(ifa, n, &inet6_addr_lst[state->bucket],
5c578aed 3013 addr_lst)
c2e21293 3014 if (net_eq(dev_net(ifa->idev->dev), net))
3015 return ifa;
1da177e4 3016 }
c2e21293 3017 return NULL;
1da177e4
LT		 3018}
3019
c2e21293 3020static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3021 struct inet6_ifaddr *ifa)
1da177e4
LT		 3022{
3023 struct if6_iter_state *state = seq->private;
1218854a 3024 struct net *net = seq_file_net(seq);
c2e21293 3025 struct hlist_node *n = &ifa->addr_lst;
1da177e4 3026
4f70ecca 3027 hlist_for_each_entry_continue_rcu_bh(ifa, n, addr_lst)
c2e21293 3028 if (net_eq(dev_net(ifa->idev->dev), net))
3029 return ifa;
3c40090a 3030
c2e21293 3031 while (++state->bucket < IN6_ADDR_HSIZE) {
4f70ecca 3032 hlist_for_each_entry_rcu_bh(ifa, n,
c2e21293 3033 &inet6_addr_lst[state->bucket], addr_lst) {
3034 if (net_eq(dev_net(ifa->idev->dev), net))
3035 return ifa;
3036 }
1da177e4 3037 }
3c40090a 3038
c2e21293 3039 return NULL;
1da177e4
LT		 3040}
3041
3042static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
3043{
3044 struct inet6_ifaddr *ifa = if6_get_first(seq);
3045
3046 if (ifa)
e21e8467 3047 while (pos && (ifa = if6_get_next(seq, ifa)) != NULL)
1da177e4
LT		 3048 --pos;
3049 return pos ? NULL : ifa;
3050}
3051
3052static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
4f70ecca 3053 __acquires(rcu_bh)
1da177e4 3054{
5c578aed 3055 rcu_read_lock_bh();
1da177e4
LT		 3056 return if6_get_idx(seq, *pos);
3057}
3058
3059static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3060{
3061 struct inet6_ifaddr *ifa;
3062
3063 ifa = if6_get_next(seq, v);
3064 ++*pos;
3065 return ifa;
3066}
3067
3068static void if6_seq_stop(struct seq_file *seq, void *v)
4f70ecca 3069 __releases(rcu_bh)
1da177e4 3070{
5c578aed 3071 rcu_read_unlock_bh();
1da177e4
LT		 3072}
3073
3074static int if6_seq_show(struct seq_file *seq, void *v)
3075{
3076 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
4b7a4274 3077 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
b071195d 3078 &ifp->addr,
1da177e4
LT		 3079 ifp->idev->dev->ifindex,
3080 ifp->prefix_len,
3081 ifp->scope,
3082 ifp->flags,
3083 ifp->idev->dev->name);
3084 return 0;
3085}
3086
56b3d975 3087static const struct seq_operations if6_seq_ops = {
1da177e4
LT		 3088 .start = if6_seq_start,
3089 .next = if6_seq_next,
3090 .show = if6_seq_show,
3091 .stop = if6_seq_stop,
3092};
3093
3094static int if6_seq_open(struct inode *inode, struct file *file)
3095{
3c40090a
DL		 3096 return seq_open_net(inode, file, &if6_seq_ops,
3097 sizeof(struct if6_iter_state));
1da177e4
LT		 3098}
3099
9a32144e 3100static const struct file_operations if6_fops = {
1da177e4
LT		 3101 .owner = THIS_MODULE,
3102 .open = if6_seq_open,
3103 .read = seq_read,
3104 .llseek = seq_lseek,
3c40090a 3105 .release = seq_release_net,
1da177e4
LT		 3106};
3107
2c8c1e72 3108static int __net_init if6_proc_net_init(struct net *net)
1da177e4 3109{
3c40090a 3110 if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops))
1da177e4
LT		 3111 return -ENOMEM;
3112 return 0;
3113}
3114
2c8c1e72 3115static void __net_exit if6_proc_net_exit(struct net *net)
3c40090a
DL		 3116{
3117 proc_net_remove(net, "if_inet6");
3118}
3119
3120static struct pernet_operations if6_proc_net_ops = {
3121 .init = if6_proc_net_init,
3122 .exit = if6_proc_net_exit,
3123};
3124
3125int __init if6_proc_init(void)
3126{
3127 return register_pernet_subsys(&if6_proc_net_ops);
3128}
3129
1da177e4
LT		 3130void if6_proc_exit(void)
3131{
3c40090a 3132 unregister_pernet_subsys(&if6_proc_net_ops);
1da177e4
LT		 3133}
3134#endif /* CONFIG_PROC_FS */
3135
59fbb3a6 3136#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
3b9f9a1c 3137/* Check if address is a home address configured on any interface. */
389f6612 3138int ipv6_chk_home_addr(struct net *net, struct in6_addr *addr)
3b9f9a1c
NT		 3139{
3140 int ret = 0;
c2e21293 3141 struct inet6_ifaddr *ifp = NULL;
3142 struct hlist_node *n;
3a88a81d 3143 unsigned int hash = ipv6_addr_hash(addr);
c2e21293 3144
5c578aed 3145 rcu_read_lock_bh();
4f70ecca 3146 hlist_for_each_entry_rcu_bh(ifp, n, &inet6_addr_lst[hash], addr_lst) {
878628fb 3147 if (!net_eq(dev_net(ifp->idev->dev), net))
389f6612 3148 continue;
caad295f 3149 if (ipv6_addr_equal(&ifp->addr, addr) &&
3b9f9a1c
NT		 3150 (ifp->flags & IFA_F_HOMEADDRESS)) {
3151 ret = 1;
3152 break;
3153 }
3154 }
5c578aed 3155 rcu_read_unlock_bh();
3b9f9a1c
NT		 3156 return ret;
3157}
3158#endif
3159
1da177e4
LT		 3160/*
3161 * Periodic address status verification
3162 */
3163
3164static void addrconf_verify(unsigned long foo)
3165{
b2db7564 3166 unsigned long now, next, next_sec, next_sched;
1da177e4 3167 struct inet6_ifaddr *ifp;
c2e21293 3168 struct hlist_node *node;
1da177e4
LT		 3169 int i;
3170
5c578aed 3171 rcu_read_lock_bh();
3172 spin_lock(&addrconf_verify_lock);
1da177e4 3173 now = jiffies;
b2db7564 3174 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
1da177e4
LT		 3175
3176 del_timer(&addr_chk_timer);
3177
bcdd553f 3178 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
1da177e4 3179restart:
4f70ecca 3180 hlist_for_each_entry_rcu_bh(ifp, node,
5c578aed 3181 &inet6_addr_lst[i], addr_lst) {
1da177e4 3182 unsigned long age;
1da177e4
LT		 3183
3184 if (ifp->flags & IFA_F_PERMANENT)
3185 continue;
3186
3187 spin_lock(&ifp->lock);
b2db7564
YH		 3188 /* We try to batch several events at once. */
3189 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1da177e4 3190
8f27ebb9
YH		 3191 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3192 age >= ifp->valid_lft) {
1da177e4
LT		 3193 spin_unlock(&ifp->lock);
3194 in6_ifa_hold(ifp);
1da177e4
LT		 3195 ipv6_del_addr(ifp);
3196 goto restart;
8f27ebb9
YH		 3197 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3198 spin_unlock(&ifp->lock);
3199 continue;
1da177e4 3200 } else if (age >= ifp->prefered_lft) {
a1ed0526 3201 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
1da177e4
LT		 3202 int deprecate = 0;
3203
3204 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3205 deprecate = 1;
3206 ifp->flags |= IFA_F_DEPRECATED;
3207 }
3208
3209 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
3210 next = ifp->tstamp + ifp->valid_lft * HZ;
3211
3212 spin_unlock(&ifp->lock);
3213
3214 if (deprecate) {
3215 in6_ifa_hold(ifp);
1da177e4
LT		 3216
3217 ipv6_ifa_notify(0, ifp);
3218 in6_ifa_put(ifp);
3219 goto restart;
3220 }
3221#ifdef CONFIG_IPV6_PRIVACY
3222 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3223 !(ifp->flags&IFA_F_TENTATIVE)) {
88949cf4 3224 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
3225 ifp->idev->cnf.dad_transmits *
3226 ifp->idev->nd_parms->retrans_time / HZ;
3227
1da177e4
LT		 3228 if (age >= ifp->prefered_lft - regen_advance) {
3229 struct inet6_ifaddr *ifpub = ifp->ifpub;
3230 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3231 next = ifp->tstamp + ifp->prefered_lft * HZ;
3232 if (!ifp->regen_count && ifpub) {
3233 ifp->regen_count++;
3234 in6_ifa_hold(ifp);
3235 in6_ifa_hold(ifpub);
3236 spin_unlock(&ifp->lock);
5c578aed 3237
291d809b
HY		 3238 spin_lock(&ifpub->lock);
3239 ifpub->regen_count = 0;
3240 spin_unlock(&ifpub->lock);
1da177e4
LT		 3241 ipv6_create_tempaddr(ifpub, ifp);
3242 in6_ifa_put(ifpub);
3243 in6_ifa_put(ifp);
3244 goto restart;
3245 }
3246 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3247 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3248 spin_unlock(&ifp->lock);
3249#endif
3250 } else {
3251 /* ifp->prefered_lft <= ifp->valid_lft */
3252 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3253 next = ifp->tstamp + ifp->prefered_lft * HZ;
3254 spin_unlock(&ifp->lock);
3255 }
3256 }
1da177e4
LT		 3257 }
3258
b2db7564
YH		 3259 next_sec = round_jiffies_up(next);
3260 next_sched = next;
3261
3262 /* If rounded timeout is accurate enough, accept it. */
3263 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
3264 next_sched = next_sec;
3265
3266 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
3267 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
3268 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
3269
3270 ADBG((KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
3271 now, next, next_sec, next_sched));
3272
3273 addr_chk_timer.expires = next_sched;
1da177e4 3274 add_timer(&addr_chk_timer);
5c578aed 3275 spin_unlock(&addrconf_verify_lock);
3276 rcu_read_unlock_bh();
1da177e4
LT		 3277}
3278
461d8837
TG		 3279static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
3280{
3281 struct in6_addr *pfx = NULL;
3282
3283 if (addr)
3284 pfx = nla_data(addr);
3285
3286 if (local) {
3287 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3288 pfx = NULL;
3289 else
3290 pfx = nla_data(local);
3291 }
3292
3293 return pfx;
3294}
3295
ef7c79ed 3296static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
461d8837
TG		 3297 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3298 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3299 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
3300};
3301
1da177e4
LT		 3302static int
3303inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3304{
3b1e0a65 3305 struct net *net = sock_net(skb->sk);
b933f716
TG		 3306 struct ifaddrmsg *ifm;
3307 struct nlattr *tb[IFA_MAX+1];
1da177e4 3308 struct in6_addr *pfx;
b933f716 3309 int err;
1da177e4 3310
b933f716
TG		 3311 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3312 if (err < 0)
3313 return err;
3314
3315 ifm = nlmsg_data(nlh);
3316 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
1da177e4
LT		 3317 if (pfx == NULL)
3318 return -EINVAL;
3319
af284937 3320 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
1da177e4
LT		 3321}
3322
55ebaef1
NT		 3323static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3324 u32 prefered_lft, u32 valid_lft)
081bba5b 3325{
6f704992
YH		 3326 u32 flags;
3327 clock_t expires;
4bed72e4 3328 unsigned long timeout;
46d48046 3329
081bba5b
NT		 3330 if (!valid_lft || (prefered_lft > valid_lft))
3331 return -EINVAL;
3332
4bed72e4
YH		 3333 timeout = addrconf_timeout_fixup(valid_lft, HZ);
3334 if (addrconf_finite_timeout(timeout)) {
3335 expires = jiffies_to_clock_t(timeout * HZ);
3336 valid_lft = timeout;
6f704992 3337 flags = RTF_EXPIRES;
4bed72e4
YH		 3338 } else {
3339 expires = 0;
3340 flags = 0;
3341 ifa_flags |= IFA_F_PERMANENT;
6f704992 3342 }
081bba5b 3343
4bed72e4
YH		 3344 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3345 if (addrconf_finite_timeout(timeout)) {
3346 if (timeout == 0)
3347 ifa_flags |= IFA_F_DEPRECATED;
3348 prefered_lft = timeout;
3349 }
081bba5b
NT		 3350
3351 spin_lock_bh(&ifp->lock);
3b9f9a1c 3352 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
081bba5b
NT		 3353 ifp->tstamp = jiffies;
3354 ifp->valid_lft = valid_lft;
3355 ifp->prefered_lft = prefered_lft;
3356
3357 spin_unlock_bh(&ifp->lock);
3358 if (!(ifp->flags&IFA_F_TENTATIVE))
3359 ipv6_ifa_notify(0, ifp);
081bba5b 3360
46d48046 3361 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
6f704992 3362 expires, flags);
081bba5b
NT		 3363 addrconf_verify(0);
3364
3365 return 0;
3366}
3367
1da177e4
LT		 3368static int
3369inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3370{
3b1e0a65 3371 struct net *net = sock_net(skb->sk);
461d8837
TG		 3372 struct ifaddrmsg *ifm;
3373 struct nlattr *tb[IFA_MAX+1];
1da177e4 3374 struct in6_addr *pfx;
7198f8ce
TG		 3375 struct inet6_ifaddr *ifa;
3376 struct net_device *dev;
55ebaef1
NT		 3377 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3378 u8 ifa_flags;
461d8837 3379 int err;
1da177e4 3380
461d8837
TG		 3381 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3382 if (err < 0)
3383 return err;
3384
3385 ifm = nlmsg_data(nlh);
3386 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
1da177e4
LT		 3387 if (pfx == NULL)
3388 return -EINVAL;
3389
461d8837 3390 if (tb[IFA_CACHEINFO]) {
0778769d 3391 struct ifa_cacheinfo *ci;
461d8837
TG		 3392
3393 ci = nla_data(tb[IFA_CACHEINFO]);
0778769d 3394 valid_lft = ci->ifa_valid;
461d8837
TG		 3395 preferred_lft = ci->ifa_prefered;
3396 } else {
3397 preferred_lft = INFINITY_LIFE_TIME;
3398 valid_lft = INFINITY_LIFE_TIME;
0778769d
NT		 3399 }
3400
af284937 3401 dev = __dev_get_by_index(net, ifm->ifa_index);
7198f8ce
TG		 3402 if (dev == NULL)
3403 return -ENODEV;
3404
55ebaef1 3405 /* We ignore other flags so far. */
3b9f9a1c 3406 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
55ebaef1 3407
1cab3da6 3408 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
7198f8ce
TG		 3409 if (ifa == NULL) {
3410 /*
3411 * It would be best to check for !NLM_F_CREATE here but
3412 * userspace alreay relies on not having to provide this.
3413 */
af284937
DL		 3414 return inet6_addr_add(net, ifm->ifa_index, pfx,
3415 ifm->ifa_prefixlen, ifa_flags,
3416 preferred_lft, valid_lft);
081bba5b
NT		 3417 }
3418
7198f8ce
TG		 3419 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3420 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3421 err = -EEXIST;
3422 else
55ebaef1 3423 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
7198f8ce
TG		 3424
3425 in6_ifa_put(ifa);
3426
3427 return err;
1da177e4
LT		 3428}
3429
101bb229
TG		 3430static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3431 u8 scope, int ifindex)
3432{
3433 struct ifaddrmsg *ifm;
3434
3435 ifm = nlmsg_data(nlh);
3436 ifm->ifa_family = AF_INET6;
3437 ifm->ifa_prefixlen = prefixlen;
3438 ifm->ifa_flags = flags;
3439 ifm->ifa_scope = scope;
3440 ifm->ifa_index = ifindex;
3441}
3442
85486af0
TG		 3443static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3444 unsigned long tstamp, u32 preferred, u32 valid)
3445{
3446 struct ifa_cacheinfo ci;
3447
3448 ci.cstamp = (u32)(TIME_DELTA(cstamp, INITIAL_JIFFIES) / HZ * 100
3449 + TIME_DELTA(cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3450 ci.tstamp = (u32)(TIME_DELTA(tstamp, INITIAL_JIFFIES) / HZ * 100
3451 + TIME_DELTA(tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3452 ci.ifa_prefered = preferred;
3453 ci.ifa_valid = valid;
3454
3455 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3456}
3457
101bb229
TG		 3458static inline int rt_scope(int ifa_scope)
3459{
3460 if (ifa_scope & IFA_HOST)
3461 return RT_SCOPE_HOST;
3462 else if (ifa_scope & IFA_LINK)
3463 return RT_SCOPE_LINK;
3464 else if (ifa_scope & IFA_SITE)
3465 return RT_SCOPE_SITE;
3466 else
3467 return RT_SCOPE_UNIVERSE;
3468}
3469
0ab6803b
TG		 3470static inline int inet6_ifaddr_msgsize(void)
3471{
339bf98f
TG		 3472 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3473 + nla_total_size(16) /* IFA_ADDRESS */
3474 + nla_total_size(sizeof(struct ifa_cacheinfo));
0ab6803b 3475}
c5396a31 3476
1da177e4 3477static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
b6544c0b 3478 u32 pid, u32 seq, int event, unsigned int flags)
1da177e4 3479{
1da177e4 3480 struct nlmsghdr *nlh;
85486af0 3481 u32 preferred, valid;
1da177e4 3482
0ab6803b
TG		 3483 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3484 if (nlh == NULL)
26932566 3485 return -EMSGSIZE;
0ab6803b 3486
101bb229
TG		 3487 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3488 ifa->idev->dev->ifindex);
3489
1da177e4 3490 if (!(ifa->flags&IFA_F_PERMANENT)) {
85486af0
TG		 3491 preferred = ifa->prefered_lft;
3492 valid = ifa->valid_lft;
3493 if (preferred != INFINITY_LIFE_TIME) {
1da177e4 3494 long tval = (jiffies - ifa->tstamp)/HZ;
a1faa698
JR		 3495 if (preferred > tval)
3496 preferred -= tval;
3497 else
3498 preferred = 0;
85486af0
TG		 3499 if (valid != INFINITY_LIFE_TIME)
3500 valid -= tval;
1da177e4
LT		 3501 }
3502 } else {
85486af0
TG		 3503 preferred = INFINITY_LIFE_TIME;
3504 valid = INFINITY_LIFE_TIME;
3505 }
3506
0ab6803b 3507 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
26932566
PM		 3508 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3509 nlmsg_cancel(skb, nlh);
3510 return -EMSGSIZE;
3511 }
1da177e4 3512
0ab6803b 3513 return nlmsg_end(skb, nlh);
1da177e4
LT		 3514}
3515
3516static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
e431b8c0 3517 u32 pid, u32 seq, int event, u16 flags)
1da177e4 3518{
1da177e4 3519 struct nlmsghdr *nlh;
101bb229
TG		 3520 u8 scope = RT_SCOPE_UNIVERSE;
3521 int ifindex = ifmca->idev->dev->ifindex;
3522
3523 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3524 scope = RT_SCOPE_SITE;
1da177e4 3525
0ab6803b
TG		 3526 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3527 if (nlh == NULL)
26932566 3528 return -EMSGSIZE;
85486af0 3529
0ab6803b
TG		 3530 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3531 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3532 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
26932566
PM		 3533 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3534 nlmsg_cancel(skb, nlh);
3535 return -EMSGSIZE;
3536 }
85486af0 3537
0ab6803b 3538 return nlmsg_end(skb, nlh);
1da177e4
LT		 3539}
3540
3541static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
b6544c0b 3542 u32 pid, u32 seq, int event, unsigned int flags)
1da177e4 3543{
1da177e4 3544 struct nlmsghdr *nlh;
101bb229
TG		 3545 u8 scope = RT_SCOPE_UNIVERSE;
3546 int ifindex = ifaca->aca_idev->dev->ifindex;
3547
3548 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3549 scope = RT_SCOPE_SITE;
1da177e4 3550
0ab6803b
TG		 3551 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3552 if (nlh == NULL)
26932566 3553 return -EMSGSIZE;
85486af0 3554
0ab6803b
TG		 3555 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3556 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3557 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
26932566
PM		 3558 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3559 nlmsg_cancel(skb, nlh);
3560 return -EMSGSIZE;
3561 }
1da177e4 3562
0ab6803b 3563 return nlmsg_end(skb, nlh);
1da177e4
LT		 3564}
3565
e21e8467 3566enum addr_type_t {
1da177e4
LT		 3567 UNICAST_ADDR,
3568 MULTICAST_ADDR,
3569 ANYCAST_ADDR,
3570};
3571
234b27c3
ED		 3572/* called with rcu_read_lock() */
3573static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
3574 struct netlink_callback *cb, enum addr_type_t type,
3575 int s_ip_idx, int *p_ip_idx)
3576{
234b27c3
ED		 3577 struct ifmcaddr6 *ifmca;
3578 struct ifacaddr6 *ifaca;
3579 int err = 1;
3580 int ip_idx = *p_ip_idx;
3581
3582 read_lock_bh(&idev->lock);
3583 switch (type) {
502a2ffd 3584 case UNICAST_ADDR: {
3585 struct inet6_ifaddr *ifa;
3586
234b27c3 3587 /* unicast address incl. temp addr */
502a2ffd 3588 list_for_each_entry(ifa, &idev->addr_list, if_list) {
3589 if (++ip_idx < s_ip_idx)
234b27c3
ED		 3590 continue;
3591 err = inet6_fill_ifaddr(skb, ifa,
3592 NETLINK_CB(cb->skb).pid,
3593 cb->nlh->nlmsg_seq,
3594 RTM_NEWADDR,
3595 NLM_F_MULTI);
3596 if (err <= 0)
3597 break;
3598 }
3599 break;
502a2ffd 3600 }
234b27c3
ED		 3601 case MULTICAST_ADDR:
3602 /* multicast address */
3603 for (ifmca = idev->mc_list; ifmca;
3604 ifmca = ifmca->next, ip_idx++) {
3605 if (ip_idx < s_ip_idx)
3606 continue;
3607 err = inet6_fill_ifmcaddr(skb, ifmca,
3608 NETLINK_CB(cb->skb).pid,
3609 cb->nlh->nlmsg_seq,
3610 RTM_GETMULTICAST,
3611 NLM_F_MULTI);
3612 if (err <= 0)
3613 break;
3614 }
3615 break;
3616 case ANYCAST_ADDR:
3617 /* anycast address */
3618 for (ifaca = idev->ac_list; ifaca;
3619 ifaca = ifaca->aca_next, ip_idx++) {
3620 if (ip_idx < s_ip_idx)
3621 continue;
3622 err = inet6_fill_ifacaddr(skb, ifaca,
3623 NETLINK_CB(cb->skb).pid,
3624 cb->nlh->nlmsg_seq,
3625 RTM_GETANYCAST,
3626 NLM_F_MULTI);
3627 if (err <= 0)
3628 break;
3629 }
3630 break;
3631 default:
3632 break;
3633 }
3634 read_unlock_bh(&idev->lock);
3635 *p_ip_idx = ip_idx;
3636 return err;
3637}
3638
1da177e4
LT		 3639static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3640 enum addr_type_t type)
3641{
234b27c3
ED		 3642 struct net *net = sock_net(skb->sk);
3643 int h, s_h;
1da177e4
LT		 3644 int idx, ip_idx;
3645 int s_idx, s_ip_idx;
1da177e4 3646 struct net_device *dev;
234b27c3
ED		 3647 struct inet6_dev *idev;
3648 struct hlist_head *head;
3649 struct hlist_node *node;
1ab1457c 3650
234b27c3
ED		 3651 s_h = cb->args[0];
3652 s_idx = idx = cb->args[1];
3653 s_ip_idx = ip_idx = cb->args[2];
5d5619b4 3654
234b27c3
ED		 3655 rcu_read_lock();
3656 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
3657 idx = 0;
3658 head = &net->dev_index_head[h];
3659 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
3660 if (idx < s_idx)
3661 goto cont;
4b97efdf 3662 if (h > s_h || idx > s_idx)
234b27c3
ED		 3663 s_ip_idx = 0;
3664 ip_idx = 0;
e21e8467
SH		 3665 idev = __in6_dev_get(dev);
3666 if (!idev)
234b27c3
ED		 3667 goto cont;
3668
3669 if (in6_dump_addrs(idev, skb, cb, type,
3670 s_ip_idx, &ip_idx) <= 0)
3671 goto done;
7562f876 3672cont:
234b27c3
ED		 3673 idx++;
3674 }
1da177e4 3675 }
234b27c3
ED		 3676done:
3677 rcu_read_unlock();
3678 cb->args[0] = h;
3679 cb->args[1] = idx;
3680 cb->args[2] = ip_idx;
3681
1da177e4
LT		 3682 return skb->len;
3683}
3684
3685static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3686{
3687 enum addr_type_t type = UNICAST_ADDR;
b854272b 3688
1da177e4
LT		 3689 return inet6_dump_addr(skb, cb, type);
3690}
3691
3692static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3693{
3694 enum addr_type_t type = MULTICAST_ADDR;
b854272b 3695
1da177e4
LT		 3696 return inet6_dump_addr(skb, cb, type);
3697}
3698
3699
3700static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3701{
3702 enum addr_type_t type = ANYCAST_ADDR;
b854272b 3703
1da177e4
LT		 3704 return inet6_dump_addr(skb, cb, type);
3705}
3706
1b29fc2c
TG		 3707static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh,
3708 void *arg)
6c223828 3709{
3b1e0a65 3710 struct net *net = sock_net(in_skb->sk);
1b29fc2c
TG		 3711 struct ifaddrmsg *ifm;
3712 struct nlattr *tb[IFA_MAX+1];
6c223828
NT		 3713 struct in6_addr *addr = NULL;
3714 struct net_device *dev = NULL;
3715 struct inet6_ifaddr *ifa;
3716 struct sk_buff *skb;
6c223828
NT		 3717 int err;
3718
1b29fc2c
TG		 3719 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3720 if (err < 0)
3721 goto errout;
3722
3723 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3724 if (addr == NULL) {
3725 err = -EINVAL;
3726 goto errout;
6c223828 3727 }
6c223828 3728
1b29fc2c 3729 ifm = nlmsg_data(nlh);
6c223828 3730 if (ifm->ifa_index)
6fda7350 3731 dev = __dev_get_by_index(net, ifm->ifa_index);
6c223828 3732
e21e8467
SH		 3733 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
3734 if (!ifa) {
1b29fc2c
TG		 3735 err = -EADDRNOTAVAIL;
3736 goto errout;
3737 }
6c223828 3738
e21e8467
SH		 3739 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
3740 if (!skb) {
6c223828 3741 err = -ENOBUFS;
1b29fc2c 3742 goto errout_ifa;
6c223828
NT		 3743 }
3744
6c223828
NT		 3745 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3746 nlh->nlmsg_seq, RTM_NEWADDR, 0);
26932566
PM		 3747 if (err < 0) {
3748 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3749 WARN_ON(err == -EMSGSIZE);
3750 kfree_skb(skb);
3751 goto errout_ifa;
3752 }
6fda7350 3753 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid);
1b29fc2c 3754errout_ifa:
6c223828 3755 in6_ifa_put(ifa);
1b29fc2c 3756errout:
6c223828 3757 return err;
6c223828
NT		 3758}
3759
1da177e4
LT		 3760static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3761{
3762 struct sk_buff *skb;
c346dca1 3763 struct net *net = dev_net(ifa->idev->dev);
5d620266 3764 int err = -ENOBUFS;
1da177e4 3765
0ab6803b 3766 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
5d620266
TG		 3767 if (skb == NULL)
3768 goto errout;
3769
3770 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
26932566
PM		 3771 if (err < 0) {
3772 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3773 WARN_ON(err == -EMSGSIZE);
3774 kfree_skb(skb);
3775 goto errout;
3776 }
1ce85fe4
PNA		 3777 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3778 return;
5d620266
TG		 3779errout:
3780 if (err < 0)
6fda7350 3781 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
1da177e4
LT		 3782}
3783
b6f99a21 3784static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
1da177e4
LT		 3785 __s32 *array, int bytes)
3786{
04561c1f
TG		 3787 BUG_ON(bytes < (DEVCONF_MAX * 4));
3788
1da177e4
LT		 3789 memset(array, 0, bytes);
3790 array[DEVCONF_FORWARDING] = cnf->forwarding;
3791 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3792 array[DEVCONF_MTU6] = cnf->mtu6;
3793 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3794 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3795 array[DEVCONF_AUTOCONF] = cnf->autoconf;
3796 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3797 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3798 array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval;
3799 array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay;
3800 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3801#ifdef CONFIG_IPV6_PRIVACY
3802 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3803 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3804 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3805 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3806 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3807#endif
3808 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
65f5c7c1 3809 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
c4fd30eb 3810 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
930d6ff2
YH		 3811#ifdef CONFIG_IPV6_ROUTER_PREF
3812 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
52e16356 3813 array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval;
fa03ef38 3814#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4
YH		 3815 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3816#endif
930d6ff2 3817#endif
fbea49e1 3818 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
0bcbc926 3819 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
95c385b4
NH		 3820#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3821 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
3822#endif
7bc570c8
YH		 3823#ifdef CONFIG_IPV6_MROUTE
3824 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
3825#endif
778d80be 3826 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
1b34be74 3827 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
c3faca05 3828 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
1da177e4
LT		 3829}
3830
339bf98f
TG		 3831static inline size_t inet6_if_nlmsg_size(void)
3832{
3833 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3834 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3835 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3836 + nla_total_size(4) /* IFLA_MTU */
3837 + nla_total_size(4) /* IFLA_LINK */
3838 + nla_total_size( /* IFLA_PROTINFO */
3839 nla_total_size(4) /* IFLA_INET6_FLAGS */
3840 + nla_total_size(sizeof(struct ifla_cacheinfo))
3841 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
bf99f1bd
YH		 3842 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
3843 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
339bf98f
TG		 3844 );
3845}
c5396a31 3846
7d720c3e
TH		 3847static inline void __snmp6_fill_stats(u64 *stats, void __percpu **mib,
3848 int items, int bytes)
7f7d9a6b
HX		 3849{
3850 int i;
3851 int pad = bytes - sizeof(u64) * items;
3852 BUG_ON(pad < 0);
3853
3854 /* Use put_unaligned() because stats may not be aligned for u64. */
3855 put_unaligned(items, &stats[0]);
3856 for (i = 1; i < items; i++)
3857 put_unaligned(snmp_fold_field(mib, i), &stats[i]);
3858
3859 memset(&stats[items], 0, pad);
3860}
3861
3862static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
3863 int bytes)
3864{
e21e8467 3865 switch (attrtype) {
7f7d9a6b 3866 case IFLA_INET6_STATS:
7d720c3e 3867 __snmp6_fill_stats(stats, (void __percpu **)idev->stats.ipv6, IPSTATS_MIB_MAX, bytes);
7f7d9a6b
HX		 3868 break;
3869 case IFLA_INET6_ICMP6STATS:
7d720c3e 3870 __snmp6_fill_stats(stats, (void __percpu **)idev->stats.icmpv6, ICMP6_MIB_MAX, bytes);
7f7d9a6b
HX		 3871 break;
3872 }
3873}
3874
1ab1457c 3875static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
b6544c0b 3876 u32 pid, u32 seq, int event, unsigned int flags)
1da177e4 3877{
04561c1f 3878 struct net_device *dev = idev->dev;
bf99f1bd 3879 struct nlattr *nla;
04561c1f
TG		 3880 struct ifinfomsg *hdr;
3881 struct nlmsghdr *nlh;
3882 void *protoinfo;
3883 struct ifla_cacheinfo ci;
3884
3885 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
3886 if (nlh == NULL)
26932566 3887 return -EMSGSIZE;
04561c1f
TG		 3888
3889 hdr = nlmsg_data(nlh);
3890 hdr->ifi_family = AF_INET6;
3891 hdr->__ifi_pad = 0;
3892 hdr->ifi_type = dev->type;
3893 hdr->ifi_index = dev->ifindex;
3894 hdr->ifi_flags = dev_get_flags(dev);
3895 hdr->ifi_change = 0;
3896
3897 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
1da177e4
LT		 3898
3899 if (dev->addr_len)
04561c1f 3900 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
1da177e4 3901
04561c1f 3902 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
1da177e4 3903 if (dev->ifindex != dev->iflink)
04561c1f 3904 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
1da177e4 3905
04561c1f
TG		 3906 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
3907 if (protoinfo == NULL)
3908 goto nla_put_failure;
1da177e4 3909
04561c1f 3910 NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags);
1da177e4 3911
1da177e4
LT		 3912 ci.max_reasm_len = IPV6_MAXPLEN;
3913 ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
3914 + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3915 ci.reachable_time = idev->nd_parms->reachable_time;
3916 ci.retrans_time = idev->nd_parms->retrans_time;
04561c1f
TG		 3917 NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3918
bf99f1bd
YH		 3919 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
3920 if (nla == NULL)
04561c1f 3921 goto nla_put_failure;
bf99f1bd 3922 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
1da177e4 3923
bf99f1bd
YH		 3924 /* XXX - MC not implemented */
3925
3926 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
3927 if (nla == NULL)
3928 goto nla_put_failure;
3929 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
3930
3931 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
3932 if (nla == NULL)
3933 goto nla_put_failure;
3934 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
1da177e4 3935
04561c1f
TG		 3936 nla_nest_end(skb, protoinfo);
3937 return nlmsg_end(skb, nlh);
1da177e4 3938
04561c1f 3939nla_put_failure:
26932566
PM		 3940 nlmsg_cancel(skb, nlh);
3941 return -EMSGSIZE;
1da177e4
LT		 3942}
3943
3944static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
3945{
3b1e0a65 3946 struct net *net = sock_net(skb->sk);
84d2697d 3947 int h, s_h;
434a8a58 3948 int idx = 0, s_idx;
1da177e4
LT		 3949 struct net_device *dev;
3950 struct inet6_dev *idev;
84d2697d
ED		 3951 struct hlist_head *head;
3952 struct hlist_node *node;
1da177e4 3953
84d2697d
ED		 3954 s_h = cb->args[0];
3955 s_idx = cb->args[1];
3956
3957 rcu_read_lock();
3958 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
3959 idx = 0;
3960 head = &net->dev_index_head[h];
3961 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
3962 if (idx < s_idx)
3963 goto cont;
3964 idev = __in6_dev_get(dev);
3965 if (!idev)
3966 goto cont;
3967 if (inet6_fill_ifinfo(skb, idev,
3968 NETLINK_CB(cb->skb).pid,
3969 cb->nlh->nlmsg_seq,
3970 RTM_NEWLINK, NLM_F_MULTI) <= 0)
3971 goto out;
7562f876 3972cont:
84d2697d
ED		 3973 idx++;
3974 }
1da177e4 3975 }
84d2697d
ED		 3976out:
3977 rcu_read_unlock();
3978 cb->args[1] = idx;
3979 cb->args[0] = h;
1da177e4
LT		 3980
3981 return skb->len;
3982}
3983
3984void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
3985{
3986 struct sk_buff *skb;
c346dca1 3987 struct net *net = dev_net(idev->dev);
8d7a76c9 3988 int err = -ENOBUFS;
1ab1457c 3989
339bf98f 3990 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
8d7a76c9
TG		 3991 if (skb == NULL)
3992 goto errout;
3993
3994 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
26932566
PM		 3995 if (err < 0) {
3996 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
3997 WARN_ON(err == -EMSGSIZE);
3998 kfree_skb(skb);
3999 goto errout;
4000 }
1ce85fe4
PNA		 4001 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
4002 return;
8d7a76c9
TG		 4003errout:
4004 if (err < 0)
6fda7350 4005 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
1da177e4
LT		 4006}
4007
339bf98f
TG		 4008static inline size_t inet6_prefix_nlmsg_size(void)
4009{
4010 return NLMSG_ALIGN(sizeof(struct prefixmsg))
4011 + nla_total_size(sizeof(struct in6_addr))
4012 + nla_total_size(sizeof(struct prefix_cacheinfo));
4013}
c5396a31 4014
1da177e4 4015static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
6051e2f4
TG		 4016 struct prefix_info *pinfo, u32 pid, u32 seq,
4017 int event, unsigned int flags)
1da177e4 4018{
6051e2f4
TG		 4019 struct prefixmsg *pmsg;
4020 struct nlmsghdr *nlh;
1da177e4
LT		 4021 struct prefix_cacheinfo ci;
4022
6051e2f4
TG		 4023 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
4024 if (nlh == NULL)
26932566 4025 return -EMSGSIZE;
6051e2f4
TG		 4026
4027 pmsg = nlmsg_data(nlh);
1da177e4 4028 pmsg->prefix_family = AF_INET6;
8a47077a
PM		 4029 pmsg->prefix_pad1 = 0;
4030 pmsg->prefix_pad2 = 0;
1da177e4
LT		 4031 pmsg->prefix_ifindex = idev->dev->ifindex;
4032 pmsg->prefix_len = pinfo->prefix_len;
4033 pmsg->prefix_type = pinfo->type;
8a47077a 4034 pmsg->prefix_pad3 = 0;
1da177e4
LT		 4035 pmsg->prefix_flags = 0;
4036 if (pinfo->onlink)
4037 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
4038 if (pinfo->autoconf)
4039 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
4040
6051e2f4 4041 NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
1da177e4
LT		 4042
4043 ci.preferred_time = ntohl(pinfo->prefered);
4044 ci.valid_time = ntohl(pinfo->valid);
6051e2f4 4045 NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
1da177e4 4046
6051e2f4 4047 return nlmsg_end(skb, nlh);
1da177e4 4048
6051e2f4 4049nla_put_failure:
26932566
PM		 4050 nlmsg_cancel(skb, nlh);
4051 return -EMSGSIZE;
1da177e4
LT		 4052}
4053
1ab1457c 4054static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4
LT		 4055 struct prefix_info *pinfo)
4056{
4057 struct sk_buff *skb;
c346dca1 4058 struct net *net = dev_net(idev->dev);
8c384bfa 4059 int err = -ENOBUFS;
1da177e4 4060
339bf98f 4061 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
8c384bfa
TG		 4062 if (skb == NULL)
4063 goto errout;
4064
4065 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
26932566
PM		 4066 if (err < 0) {
4067 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
4068 WARN_ON(err == -EMSGSIZE);
4069 kfree_skb(skb);
4070 goto errout;
4071 }
1ce85fe4
PNA		 4072 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
4073 return;
8c384bfa
TG		 4074errout:
4075 if (err < 0)
6fda7350 4076 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
1da177e4
LT		 4077}
4078
1da177e4
LT		 4079static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4080{
4081 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
4082
4083 switch (event) {
4084 case RTM_NEWADDR:
95c385b4
NH		 4085 /*
4086 * If the address was optimistic
4087 * we inserted the route at the start of
4088 * our DAD process, so we don't need
4089 * to do it again
4090 */
4091 if (!(ifp->rt->rt6i_node))
4092 ip6_ins_rt(ifp->rt);
1da177e4
LT		 4093 if (ifp->idev->cnf.forwarding)
4094 addrconf_join_anycast(ifp);
4095 break;
4096 case RTM_DELADDR:
4097 if (ifp->idev->cnf.forwarding)
4098 addrconf_leave_anycast(ifp);
4099 addrconf_leave_solict(ifp->idev, &ifp->addr);
4100 dst_hold(&ifp->rt->u.dst);
93fa159a 4101
e9d3e084
HX		 4102 if (ifp->state == INET6_IFADDR_STATE_DEAD &&
4103 ip6_del_rt(ifp->rt))
1da177e4 4104 dst_free(&ifp->rt->u.dst);
1da177e4
LT		 4105 break;
4106 }
4107}
4108
4109static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4110{
8814c4b5 4111 rcu_read_lock_bh();
1da177e4
LT		 4112 if (likely(ifp->idev->dead == 0))
4113 __ipv6_ifa_notify(event, ifp);
8814c4b5 4114 rcu_read_unlock_bh();
1da177e4
LT		 4115}
4116
4117#ifdef CONFIG_SYSCTL
4118
4119static
8d65af78 4120int addrconf_sysctl_forward(ctl_table *ctl, int write,
1da177e4
LT		 4121 void __user *buffer, size_t *lenp, loff_t *ppos)
4122{
4123 int *valp = ctl->data;
4124 int val = *valp;
88af182e 4125 loff_t pos = *ppos;
1da177e4
LT		 4126 int ret;
4127
8d65af78 4128 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
1da177e4 4129
c8fecf22 4130 if (write)
b325fddb 4131 ret = addrconf_fixup_forwarding(ctl, valp, val);
88af182e
EB		 4132 if (ret)
4133 *ppos = pos;
1ab1457c 4134 return ret;
1da177e4
LT		 4135}
4136
56d417b1
BH		 4137static void dev_disable_change(struct inet6_dev *idev)
4138{
4139 if (!idev || !idev->dev)
4140 return;
4141
4142 if (idev->cnf.disable_ipv6)
4143 addrconf_notify(NULL, NETDEV_DOWN, idev->dev);
4144 else
4145 addrconf_notify(NULL, NETDEV_UP, idev->dev);
4146}
4147
4148static void addrconf_disable_change(struct net *net, __s32 newf)
4149{
4150 struct net_device *dev;
4151 struct inet6_dev *idev;
4152
c6d14c84
ED		 4153 rcu_read_lock();
4154 for_each_netdev_rcu(net, dev) {
56d417b1
BH		 4155 idev = __in6_dev_get(dev);
4156 if (idev) {
4157 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
4158 idev->cnf.disable_ipv6 = newf;
4159 if (changed)
4160 dev_disable_change(idev);
4161 }
56d417b1 4162 }
c6d14c84 4163 rcu_read_unlock();
56d417b1
BH		 4164}
4165
4166static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int old)
4167{
4168 struct net *net;
4169
4170 net = (struct net *)table->extra2;
4171
4172 if (p == &net->ipv6.devconf_dflt->disable_ipv6)
4173 return 0;
4174
88af182e
EB		 4175 if (!rtnl_trylock()) {
4176 /* Restore the original values before restarting */
4177 *p = old;
56d417b1 4178 return restart_syscall();
88af182e 4179 }
56d417b1
BH		 4180
4181 if (p == &net->ipv6.devconf_all->disable_ipv6) {
4182 __s32 newf = net->ipv6.devconf_all->disable_ipv6;
4183 net->ipv6.devconf_dflt->disable_ipv6 = newf;
4184 addrconf_disable_change(net, newf);
4185 } else if ((!*p) ^ (!old))
4186 dev_disable_change((struct inet6_dev *)table->extra1);
4187
4188 rtnl_unlock();
4189 return 0;
4190}
4191
4192static
8d65af78 4193int addrconf_sysctl_disable(ctl_table *ctl, int write,
56d417b1
BH		 4194 void __user *buffer, size_t *lenp, loff_t *ppos)
4195{
4196 int *valp = ctl->data;
4197 int val = *valp;
88af182e 4198 loff_t pos = *ppos;
56d417b1
BH		 4199 int ret;
4200
8d65af78 4201 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
56d417b1
BH		 4202
4203 if (write)
4204 ret = addrconf_disable_ipv6(ctl, valp, val);
88af182e
EB		 4205 if (ret)
4206 *ppos = pos;
56d417b1
BH		 4207 return ret;
4208}
4209
1da177e4
LT		 4210static struct addrconf_sysctl_table
4211{
4212 struct ctl_table_header *sysctl_header;
f6a07b29 4213 ctl_table addrconf_vars[DEVCONF_MAX+1];
1dab6222 4214 char *dev_name;
ab32ea5d 4215} addrconf_sysctl __read_mostly = {
1da177e4
LT		 4216 .sysctl_header = NULL,
4217 .addrconf_vars = {
1ab1457c 4218 {
e21e8467
SH		 4219 .procname = "forwarding",
4220 .data = &ipv6_devconf.forwarding,
4221 .maxlen = sizeof(int),
4222 .mode = 0644,
4223 .proc_handler = addrconf_sysctl_forward,
1da177e4
LT		 4224 },
4225 {
e21e8467
SH		 4226 .procname = "hop_limit",
4227 .data = &ipv6_devconf.hop_limit,
4228 .maxlen = sizeof(int),
4229 .mode = 0644,
4230 .proc_handler = proc_dointvec,
1da177e4
LT		 4231 },
4232 {
e21e8467
SH		 4233 .procname = "mtu",
4234 .data = &ipv6_devconf.mtu6,
4235 .maxlen = sizeof(int),
4236 .mode = 0644,
4237 .proc_handler = proc_dointvec,
1da177e4
LT		 4238 },
4239 {
e21e8467
SH		 4240 .procname = "accept_ra",
4241 .data = &ipv6_devconf.accept_ra,
4242 .maxlen = sizeof(int),
4243 .mode = 0644,
4244 .proc_handler = proc_dointvec,
1da177e4
LT		 4245 },
4246 {
e21e8467
SH		 4247 .procname = "accept_redirects",
4248 .data = &ipv6_devconf.accept_redirects,
4249 .maxlen = sizeof(int),
4250 .mode = 0644,
4251 .proc_handler = proc_dointvec,
1da177e4
LT		 4252 },
4253 {
e21e8467
SH		 4254 .procname = "autoconf",
4255 .data = &ipv6_devconf.autoconf,
4256 .maxlen = sizeof(int),
4257 .mode = 0644,
4258 .proc_handler = proc_dointvec,
1da177e4
LT		 4259 },
4260 {
e21e8467
SH		 4261 .procname = "dad_transmits",
4262 .data = &ipv6_devconf.dad_transmits,
4263 .maxlen = sizeof(int),
4264 .mode = 0644,
4265 .proc_handler = proc_dointvec,
1da177e4
LT		 4266 },
4267 {
e21e8467
SH		 4268 .procname = "router_solicitations",
4269 .data = &ipv6_devconf.rtr_solicits,
4270 .maxlen = sizeof(int),
4271 .mode = 0644,
4272 .proc_handler = proc_dointvec,
1da177e4
LT		 4273 },
4274 {
e21e8467
SH		 4275 .procname = "router_solicitation_interval",
4276 .data = &ipv6_devconf.rtr_solicit_interval,
4277 .maxlen = sizeof(int),
4278 .mode = 0644,
4279 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 4280 },
4281 {
e21e8467
SH		 4282 .procname = "router_solicitation_delay",
4283 .data = &ipv6_devconf.rtr_solicit_delay,
4284 .maxlen = sizeof(int),
4285 .mode = 0644,
4286 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 4287 },
4288 {
e21e8467
SH		 4289 .procname = "force_mld_version",
4290 .data = &ipv6_devconf.force_mld_version,
4291 .maxlen = sizeof(int),
4292 .mode = 0644,
4293 .proc_handler = proc_dointvec,
1da177e4
LT		 4294 },
4295#ifdef CONFIG_IPV6_PRIVACY
4296 {
e21e8467
SH		 4297 .procname = "use_tempaddr",
4298 .data = &ipv6_devconf.use_tempaddr,
4299 .maxlen = sizeof(int),
4300 .mode = 0644,
4301 .proc_handler = proc_dointvec,
1da177e4
LT		 4302 },
4303 {
e21e8467
SH		 4304 .procname = "temp_valid_lft",
4305 .data = &ipv6_devconf.temp_valid_lft,
4306 .maxlen = sizeof(int),
4307 .mode = 0644,
4308 .proc_handler = proc_dointvec,
1da177e4
LT		 4309 },
4310 {
e21e8467
SH		 4311 .procname = "temp_prefered_lft",
4312 .data = &ipv6_devconf.temp_prefered_lft,
4313 .maxlen = sizeof(int),
4314 .mode = 0644,
4315 .proc_handler = proc_dointvec,
1da177e4
LT		 4316 },
4317 {
e21e8467
SH		 4318 .procname = "regen_max_retry",
4319 .data = &ipv6_devconf.regen_max_retry,
4320 .maxlen = sizeof(int),
4321 .mode = 0644,
4322 .proc_handler = proc_dointvec,
1da177e4
LT		 4323 },
4324 {
e21e8467
SH		 4325 .procname = "max_desync_factor",
4326 .data = &ipv6_devconf.max_desync_factor,
4327 .maxlen = sizeof(int),
4328 .mode = 0644,
4329 .proc_handler = proc_dointvec,
1da177e4
LT		 4330 },
4331#endif
4332 {
e21e8467
SH		 4333 .procname = "max_addresses",
4334 .data = &ipv6_devconf.max_addresses,
4335 .maxlen = sizeof(int),
4336 .mode = 0644,
4337 .proc_handler = proc_dointvec,
1da177e4 4338 },
65f5c7c1 4339 {
e21e8467
SH		 4340 .procname = "accept_ra_defrtr",
4341 .data = &ipv6_devconf.accept_ra_defrtr,
4342 .maxlen = sizeof(int),
4343 .mode = 0644,
4344 .proc_handler = proc_dointvec,
65f5c7c1 4345 },
c4fd30eb 4346 {
e21e8467
SH		 4347 .procname = "accept_ra_pinfo",
4348 .data = &ipv6_devconf.accept_ra_pinfo,
4349 .maxlen = sizeof(int),
4350 .mode = 0644,
4351 .proc_handler = proc_dointvec,
c4fd30eb 4352 },
930d6ff2
YH		 4353#ifdef CONFIG_IPV6_ROUTER_PREF
4354 {
e21e8467
SH		 4355 .procname = "accept_ra_rtr_pref",
4356 .data = &ipv6_devconf.accept_ra_rtr_pref,
4357 .maxlen = sizeof(int),
4358 .mode = 0644,
4359 .proc_handler = proc_dointvec,
930d6ff2 4360 },
52e16356 4361 {
e21e8467
SH		 4362 .procname = "router_probe_interval",
4363 .data = &ipv6_devconf.rtr_probe_interval,
4364 .maxlen = sizeof(int),
4365 .mode = 0644,
4366 .proc_handler = proc_dointvec_jiffies,
52e16356 4367 },
fa03ef38 4368#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4 4369 {
e21e8467
SH		 4370 .procname = "accept_ra_rt_info_max_plen",
4371 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
4372 .maxlen = sizeof(int),
4373 .mode = 0644,
4374 .proc_handler = proc_dointvec,
09c884d4
YH		 4375 },
4376#endif
930d6ff2 4377#endif
fbea49e1 4378 {
e21e8467
SH		 4379 .procname = "proxy_ndp",
4380 .data = &ipv6_devconf.proxy_ndp,
4381 .maxlen = sizeof(int),
4382 .mode = 0644,
4383 .proc_handler = proc_dointvec,
fbea49e1 4384 },
0bcbc926 4385 {
e21e8467
SH		 4386 .procname = "accept_source_route",
4387 .data = &ipv6_devconf.accept_source_route,
4388 .maxlen = sizeof(int),
4389 .mode = 0644,
4390 .proc_handler = proc_dointvec,
0bcbc926 4391 },
95c385b4
NH		 4392#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4393 {
e21e8467
SH		 4394 .procname = "optimistic_dad",
4395 .data = &ipv6_devconf.optimistic_dad,
4396 .maxlen = sizeof(int),
4397 .mode = 0644,
4398 .proc_handler = proc_dointvec,
95c385b4
NH		 4399
4400 },
7bc570c8
YH		 4401#endif
4402#ifdef CONFIG_IPV6_MROUTE
4403 {
e21e8467
SH		 4404 .procname = "mc_forwarding",
4405 .data = &ipv6_devconf.mc_forwarding,
4406 .maxlen = sizeof(int),
4407 .mode = 0444,
4408 .proc_handler = proc_dointvec,
7bc570c8 4409 },
95c385b4 4410#endif
778d80be 4411 {
e21e8467
SH		 4412 .procname = "disable_ipv6",
4413 .data = &ipv6_devconf.disable_ipv6,
4414 .maxlen = sizeof(int),
4415 .mode = 0644,
4416 .proc_handler = addrconf_sysctl_disable,
778d80be 4417 },
1b34be74 4418 {
e21e8467
SH		 4419 .procname = "accept_dad",
4420 .data = &ipv6_devconf.accept_dad,
4421 .maxlen = sizeof(int),
4422 .mode = 0644,
4423 .proc_handler = proc_dointvec,
1b34be74 4424 },
f7734fdf 4425 {
f7734fdf
OP		 4426 .procname = "force_tllao",
4427 .data = &ipv6_devconf.force_tllao,
4428 .maxlen = sizeof(int),
4429 .mode = 0644,
4430 .proc_handler = proc_dointvec
4431 },
1da177e4 4432 {
f8572d8f 4433 /* sentinel */
1da177e4
LT		 4434 }
4435 },
1da177e4
LT		 4436};
4437
bff16c2f 4438static int __addrconf_sysctl_register(struct net *net, char *dev_name,
f8572d8f 4439 struct inet6_dev *idev, struct ipv6_devconf *p)
1da177e4
LT		 4440{
4441 int i;
1da177e4 4442 struct addrconf_sysctl_table *t;
1da177e4 4443
1dab6222
PE		 4444#define ADDRCONF_CTL_PATH_DEV 3
4445
4446 struct ctl_path addrconf_ctl_path[] = {
f8572d8f
EB		 4447 { .procname = "net", },
4448 { .procname = "ipv6", },
4449 { .procname = "conf", },
1dab6222
PE		 4450 { /* to be set */ },
4451 { },
4452 };
4453
4454
af879cc7 4455 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
1da177e4 4456 if (t == NULL)
f68635e6
PE		 4457 goto out;
4458
bcdd553f 4459 for (i = 0; t->addrconf_vars[i].data; i++) {
e21e8467 4460 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
1da177e4 4461 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
bff16c2f 4462 t->addrconf_vars[i].extra2 = net;
1da177e4 4463 }
1da177e4 4464
1ab1457c
YH		 4465 /*
4466 * Make a copy of dev_name, because '.procname' is regarded as const
1da177e4
LT		 4467 * by sysctl and we wouldn't want anyone to change it under our feet
4468 * (see SIOCSIFNAME).
1ab1457c 4469 */
1dab6222
PE		 4470 t->dev_name = kstrdup(dev_name, GFP_KERNEL);
4471 if (!t->dev_name)
f68635e6 4472 goto free;
1da177e4 4473
1dab6222 4474 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].procname = t->dev_name;
1da177e4 4475
bff16c2f 4476 t->sysctl_header = register_net_sysctl_table(net, addrconf_ctl_path,
1dab6222 4477 t->addrconf_vars);
1da177e4
LT		 4478 if (t->sysctl_header == NULL)
4479 goto free_procname;
f68635e6
PE		 4480
4481 p->sysctl = t;
95897312 4482 return 0;
1da177e4 4483
f68635e6 4484free_procname:
1dab6222 4485 kfree(t->dev_name);
f68635e6 4486free:
1da177e4 4487 kfree(t);
f68635e6 4488out:
95897312 4489 return -ENOBUFS;
1da177e4
LT		 4490}
4491
408c4768
PE		 4492static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
4493{
4494 struct addrconf_sysctl_table *t;
4495
4496 if (p->sysctl == NULL)
4497 return;
4498
4499 t = p->sysctl;
4500 p->sysctl = NULL;
4501 unregister_sysctl_table(t->sysctl_header);
4502 kfree(t->dev_name);
4503 kfree(t);
4504}
4505
f52295a9
PE		 4506static void addrconf_sysctl_register(struct inet6_dev *idev)
4507{
54716e3b 4508 neigh_sysctl_register(idev->dev, idev->nd_parms, "ipv6",
f8572d8f 4509 &ndisc_ifinfo_sysctl_change);
c346dca1 4510 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
f8572d8f 4511 idev, &idev->cnf);
f52295a9
PE		 4512}
4513
408c4768 4514static void addrconf_sysctl_unregister(struct inet6_dev *idev)
1da177e4 4515{
408c4768
PE		 4516 __addrconf_sysctl_unregister(&idev->cnf);
4517 neigh_sysctl_unregister(idev->nd_parms);
1da177e4
LT		 4518}
4519
4520
4521#endif
4522
2c8c1e72 4523static int __net_init addrconf_init_net(struct net *net)
e0da5a48
PE		 4524{
4525 int err;
4526 struct ipv6_devconf *all, *dflt;
4527
4528 err = -ENOMEM;
4529 all = &ipv6_devconf;
4530 dflt = &ipv6_devconf_dflt;
4531
09ad9bc7 4532 if (!net_eq(net, &init_net)) {
e0da5a48
PE		 4533 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL);
4534 if (all == NULL)
4535 goto err_alloc_all;
4536
4537 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
4538 if (dflt == NULL)
4539 goto err_alloc_dflt;
56d417b1
BH		 4540 } else {
4541 /* these will be inherited by all namespaces */
4542 dflt->autoconf = ipv6_defaults.autoconf;
4543 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
e0da5a48
PE		 4544 }
4545
4546 net->ipv6.devconf_all = all;
4547 net->ipv6.devconf_dflt = dflt;
4548
4549#ifdef CONFIG_SYSCTL
f8572d8f 4550 err = __addrconf_sysctl_register(net, "all", NULL, all);
e0da5a48
PE		 4551 if (err < 0)
4552 goto err_reg_all;
4553
f8572d8f 4554 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
e0da5a48
PE		 4555 if (err < 0)
4556 goto err_reg_dflt;
4557#endif
4558 return 0;
4559
4560#ifdef CONFIG_SYSCTL
4561err_reg_dflt:
4562 __addrconf_sysctl_unregister(all);
4563err_reg_all:
4564 kfree(dflt);
4565#endif
4566err_alloc_dflt:
4567 kfree(all);
4568err_alloc_all:
4569 return err;
4570}
4571
2c8c1e72 4572static void __net_exit addrconf_exit_net(struct net *net)
e0da5a48
PE		 4573{
4574#ifdef CONFIG_SYSCTL
4575 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
4576 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
4577#endif
09ad9bc7 4578 if (!net_eq(net, &init_net)) {
e0da5a48
PE		 4579 kfree(net->ipv6.devconf_dflt);
4580 kfree(net->ipv6.devconf_all);
4581 }
4582}
4583
4584static struct pernet_operations addrconf_ops = {
4585 .init = addrconf_init_net,
4586 .exit = addrconf_exit_net,
4587};
4588
1da177e4
LT		 4589/*
4590 * Device notifier
4591 */
4592
4593int register_inet6addr_notifier(struct notifier_block *nb)
4594{
1ab1457c 4595 return atomic_notifier_chain_register(&inet6addr_chain, nb);
1da177e4 4596}
7159039a
YH		 4597EXPORT_SYMBOL(register_inet6addr_notifier);
4598
1da177e4
LT		 4599int unregister_inet6addr_notifier(struct notifier_block *nb)
4600{
e21e8467 4601 return atomic_notifier_chain_unregister(&inet6addr_chain, nb);
1da177e4 4602}
7159039a
YH		 4603EXPORT_SYMBOL(unregister_inet6addr_notifier);
4604
1da177e4
LT		 4605/*
4606 * Init / cleanup code
4607 */
4608
4609int __init addrconf_init(void)
4610{
c2e21293 4611 int i, err;
2a8cc6c8 4612
e21e8467
SH		 4613 err = ipv6_addr_label_init();
4614 if (err < 0) {
4615 printk(KERN_CRIT "IPv6 Addrconf:"
4616 " cannot initialize default policy table: %d.\n", err);
2a8cc6c8
YH		 4617 return err;
4618 }
1da177e4 4619
e0da5a48
PE		 4620 register_pernet_subsys(&addrconf_ops);
4621
1da177e4
LT		 4622 /* The addrconf netdev notifier requires that loopback_dev
4623 * has it's ipv6 private information allocated and setup
4624 * before it can bring up and give link-local addresses
4625 * to other devices which are up.
4626 *
4627 * Unfortunately, loopback_dev is not necessarily the first
4628 * entry in the global dev_base list of net devices. In fact,
4629 * it is likely to be the very last entry on that list.
4630 * So this causes the notifier registry below to try and
4631 * give link-local addresses to all devices besides loopback_dev
4632 * first, then loopback_dev, which cases all the non-loopback_dev
4633 * devices to fail to get a link-local address.
4634 *
4635 * So, as a temporary fix, allocate the ipv6 structure for
4636 * loopback_dev first by hand.
4637 * Longer term, all of the dependencies ipv6 has upon the loopback
4638 * device and it being up should be removed.
4639 */
4640 rtnl_lock();
2774c7ab 4641 if (!ipv6_add_dev(init_net.loopback_dev))
1da177e4
LT		 4642 err = -ENOMEM;
4643 rtnl_unlock();
4644 if (err)
e0da5a48 4645 goto errlo;
1da177e4 4646
c2e21293 4647 for (i = 0; i < IN6_ADDR_HSIZE; i++)
4648 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
4649
1da177e4
LT		 4650 register_netdevice_notifier(&ipv6_dev_notf);
4651
1da177e4 4652 addrconf_verify(0);
c127ea2c
TG		 4653
4654 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo);
4655 if (err < 0)
4656 goto errout;
4657
4658 /* Only the first call to __rtnl_register can fail */
4659 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL);
4660 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL);
4661 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, inet6_dump_ifaddr);
4662 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, inet6_dump_ifmcaddr);
4663 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, inet6_dump_ifacaddr);
4664
2a8cc6c8
YH		 4665 ipv6_addr_label_rtnl_register();
4666
1da177e4 4667 return 0;
c127ea2c
TG		 4668errout:
4669 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48
PE		 4670errlo:
4671 unregister_pernet_subsys(&addrconf_ops);
c127ea2c
TG		 4672
4673 return err;
1da177e4
LT		 4674}
4675
09f7709f 4676void addrconf_cleanup(void)
1da177e4 4677{
176c39af 4678 struct net_device *dev;
1da177e4
LT		 4679 int i;
4680
4681 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48 4682 unregister_pernet_subsys(&addrconf_ops);
1da177e4
LT		 4683
4684 rtnl_lock();
4685
176c39af
DL		 4686 /* clean dev list */
4687 for_each_netdev(&init_net, dev) {
4688 if (__in6_dev_get(dev) == NULL)
4689 continue;
4690 addrconf_ifdown(dev, 1);
4691 }
4692 addrconf_ifdown(init_net.loopback_dev, 2);
4693
1da177e4
LT		 4694 /*
4695 * Check hash table.
4696 */
5c578aed 4697 spin_lock_bh(&addrconf_hash_lock);
c2e21293 4698 for (i = 0; i < IN6_ADDR_HSIZE; i++)
4699 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
5c578aed 4700 spin_unlock_bh(&addrconf_hash_lock);
1da177e4
LT		 4701
4702 del_timer(&addr_chk_timer);
1da177e4 4703 rtnl_unlock();
1da177e4 4704}
Clone of davem's net-next-2.6 tree